diff --git a/AGENTS.md b/AGENTS.md
index 2185952..33a08b6 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -114,6 +114,7 @@ The **Firebase config in `leader-board.js` is intentionally public and committed
 
 - **Code style is enforced by ESLint Stylistic**, not Prettier: 2-space indent, single quotes, **no semicolons**, no trailing commas, spaces inside `{ braces }` but not `[brackets]`. Run `pnpm lint:fix` before committing. Both `**/*.js` and `**/*.css` are linted (CSS via `@eslint/css`).
 - The engine uses **plain functions and `var`/`let` closures**, not classes; `packages/utils/` and `apps/mnswpr/modules/` use ES classes. Match the surrounding style of the file you edit.
+- **Types are generated, not authored.** Source stays JS + JSDoc (`// @ts-check`); `tsc` is a build-time tool that emits `.d.ts` from that JSDoc so published `@cozy-games/*` packages ship types. Declarations are emitted **co-located** next to each source file and **committed** — `pnpm build:types` (`scripts/build-types.mjs`) deletes the previous ones and re-runs `tsc -p tsconfig.types.json`, since TypeScript won't emit over an existing `.d.ts` (TS5055). The type-check runs `strict: false` and covers only the files named in that config's `include` list — adding a new published source file means adding it there, or it ships without types. After touching JSDoc on an included file, run `pnpm build:types` and commit the regenerated declarations.
 
 ## Release & git hooks (maintainer workflow)
 
diff --git a/packages/leaderboard/leader-board.d.ts b/packages/leaderboard/leader-board.d.ts
index fd8d4dd..29edd48 100644
--- a/packages/leaderboard/leader-board.d.ts
+++ b/packages/leaderboard/leader-board.d.ts
@@ -55,13 +55,18 @@ export class LeaderBoardService {
     /**
      * Read surface — render the ranked list with a duration tab bar.
      * @see LeaderBoardReader#render
+     * @param {String} category
+     * @param {String} title
+     * @param {String} [duration]
+     * @returns {Promise<HTMLDivElement>}
      */
-    render(category: any, title: any, duration: any): Promise<HTMLDivElement>;
+    render(category: string, title: string, duration?: string): Promise<HTMLDivElement>;
     /**
      * Write surface — submit a completed game (archive + ranked entry).
      * @see LeaderBoardWriter#submit
+     * @param {import('./leaderboard-write.js').ScoreEntry} entry
      */
-    submit(entry: any): Promise<void>;
+    submit(entry: import("./leaderboard-write.js").ScoreEntry): Promise<void>;
 }
 import { LeaderBoardReader } from './leaderboard-read.js';
 import { LeaderBoardWriter } from './leaderboard-write.js';
diff --git a/packages/leaderboard/leader-board.js b/packages/leaderboard/leader-board.js
index ff47627..9b3ec77 100644
--- a/packages/leaderboard/leader-board.js
+++ b/packages/leaderboard/leader-board.js
@@ -50,6 +50,10 @@ export class LeaderBoardService {
   /**
    * Read surface — render the ranked list with a duration tab bar.
    * @see LeaderBoardReader#render
+   * @param {String} category
+   * @param {String} title
+   * @param {String} [duration]
+   * @returns {Promise<HTMLDivElement>}
    */
   render(category, title, duration) {
     return this.reader.render(category, title, duration)
@@ -58,6 +62,7 @@ export class LeaderBoardService {
   /**
    * Write surface — submit a completed game (archive + ranked entry).
    * @see LeaderBoardWriter#submit
+   * @param {import('./leaderboard-write.js').ScoreEntry} entry
    */
   submit(entry) {
     return this.writer.submit(entry)
diff --git a/packages/leaderboard/leaderboard-write.d.ts b/packages/leaderboard/leaderboard-write.d.ts
index d87943f..4b44605 100644
--- a/packages/leaderboard/leaderboard-write.d.ts
+++ b/packages/leaderboard/leaderboard-write.d.ts
@@ -1,3 +1,17 @@
+/**
+ * A completed-game entry offered to the leaderboard. `score` is the ranked value
+ * (sorted per the configured order); `category` selects the board; `time_stamp`
+ * is denormalized into day/week/month buckets on write.
+ *
+ * @typedef {Object} ScoreEntry
+ * @property {number} score
+ * @property {string} category
+ * @property {string} playerId
+ * @property {Date | number | string} time_stamp
+ * @property {string} [name] - display name; defaults to 'Anonymous'
+ * @property {string} [status] - outcome the default qualifier checks against `config.passingStatus`
+ * @property {Object} [meta] - optional extra fields carried through to storage
+ */
 /**
  * The WRITE surface of the leaderboard: submitting a completed game — the
  * personal archive plus, if it qualifies, a ranked entry with denormalized
@@ -33,7 +47,30 @@ export class LeaderBoardWriter {
      * qualifies, also writes a ranked entry with denormalized bucket keys. Both
      * writes go through the adapter, so the storage backend is pluggable. The
      * caller owns display-name/nickname UX.
-     * @param {Object} entry - { name, playerId, score, category, time_stamp, status?, meta? }
+     * @param {ScoreEntry} entry
      */
-    submit(entry: any): Promise<void>;
+    submit(entry: ScoreEntry): Promise<void>;
 }
+/**
+ * A completed-game entry offered to the leaderboard. `score` is the ranked value
+ * (sorted per the configured order); `category` selects the board; `time_stamp`
+ * is denormalized into day/week/month buckets on write.
+ */
+export type ScoreEntry = {
+    score: number;
+    category: string;
+    playerId: string;
+    time_stamp: Date | number | string;
+    /**
+     * - display name; defaults to 'Anonymous'
+     */
+    name?: string;
+    /**
+     * - outcome the default qualifier checks against `config.passingStatus`
+     */
+    status?: string;
+    /**
+     * - optional extra fields carried through to storage
+     */
+    meta?: any;
+};
diff --git a/packages/leaderboard/leaderboard-write.js b/packages/leaderboard/leaderboard-write.js
index 651dd2c..f02b592 100644
--- a/packages/leaderboard/leaderboard-write.js
+++ b/packages/leaderboard/leaderboard-write.js
@@ -1,5 +1,20 @@
 import { buckets } from '@cozy-games/utils/date-bucket/date-bucket.js'
 
+/**
+ * A completed-game entry offered to the leaderboard. `score` is the ranked value
+ * (sorted per the configured order); `category` selects the board; `time_stamp`
+ * is denormalized into day/week/month buckets on write.
+ *
+ * @typedef {Object} ScoreEntry
+ * @property {number} score
+ * @property {string} category
+ * @property {string} playerId
+ * @property {Date | number | string} time_stamp
+ * @property {string} [name] - display name; defaults to 'Anonymous'
+ * @property {string} [status] - outcome the default qualifier checks against `config.passingStatus`
+ * @property {Object} [meta] - optional extra fields carried through to storage
+ */
+
 /**
  * The WRITE surface of the leaderboard: submitting a completed game — the
  * personal archive plus, if it qualifies, a ranked entry with denormalized
@@ -46,7 +61,7 @@ export class LeaderBoardWriter {
    * qualifies, also writes a ranked entry with denormalized bucket keys. Both
    * writes go through the adapter, so the storage backend is pluggable. The
    * caller owns display-name/nickname UX.
-   * @param {Object} entry - { name, playerId, score, category, time_stamp, status?, meta? }
+   * @param {ScoreEntry} entry
    */
   async submit(entry) {
     if (this.adapter.archive) {
diff --git a/packages/leaderboard/package.json b/packages/leaderboard/package.json
index 8063e89..9a3844c 100644
--- a/packages/leaderboard/package.json
+++ b/packages/leaderboard/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@cozy-games/leaderboard",
-  "version": "0.0.1",
+  "version": "0.0.2",
   "description": "Generic, game-agnostic Firestore leaderboard with time-windowed views",
   "author": "Ayo Ayco",
   "type": "module",
diff --git a/packages/mnswpr/adapters/replay-common.d.ts b/packages/mnswpr/adapters/replay-common.d.ts
index 4c9cf28..86d6f10 100644
--- a/packages/mnswpr/adapters/replay-common.d.ts
+++ b/packages/mnswpr/adapters/replay-common.d.ts
@@ -1,18 +1,36 @@
 /**
- * @typedef {import('../core/minesweeper/rules.js').MoveEvent} MnswprMoveEvent
+ * A recorded mnswpr move-log entry — the `@cozy-games/move-log` / ADR-002 §1
+ * envelope shape as instantiated by Minesweeper: a surfaced `type` discriminator
+ * plus an opaque `payload` carrying the move's `{ r, c }`. This is what the replay
+ * engine hands the reducers (the only fields they read).
+ *
+ * @typedef {{ type: string, payload: { r: number, c: number } }} MnswprRecord
  */
 /**
- * Map a recorded move-event back to the rules move that produced it: `flag` and
- * `unflag` are both the toggle move `flag`; `reveal` and `chord` pass through.
- * Unknown kinds are ignored. Shared by the mnswpr replay adapters (progress and
- * full-board state) so both replay a stream through the core rules identically.
+ * Map a recorded move-log entry back to the rules move that produced it: `flag`
+ * and `unflag` are both the toggle move `flag`; `reveal` and `chord` pass
+ * through. Unknown kinds are ignored. Shared by the mnswpr replay adapters
+ * (progress and full-board state) so both replay a stream through the core rules
+ * identically.
  *
- * @param {MnswprMoveEvent} e
+ * @param {MnswprRecord} record
  * @returns {{ type: 'reveal' | 'flag' | 'chord', r: number, c: number } | null}
  */
-export function toMove(e: MnswprMoveEvent): {
+export function toMove(record: MnswprRecord): {
     type: "reveal" | "flag" | "chord";
     r: number;
     c: number;
 } | null;
-export type MnswprMoveEvent = import("../core/minesweeper/rules.js").MoveEvent;
+/**
+ * A recorded mnswpr move-log entry — the `@cozy-games/move-log` / ADR-002 §1
+ * envelope shape as instantiated by Minesweeper: a surfaced `type` discriminator
+ * plus an opaque `payload` carrying the move's `{ r, c }`. This is what the replay
+ * engine hands the reducers (the only fields they read).
+ */
+export type MnswprRecord = {
+    type: string;
+    payload: {
+        r: number;
+        c: number;
+    };
+};
diff --git a/packages/mnswpr/adapters/replay-common.js b/packages/mnswpr/adapters/replay-common.js
index 13c6195..ce5c42c 100644
--- a/packages/mnswpr/adapters/replay-common.js
+++ b/packages/mnswpr/adapters/replay-common.js
@@ -1,24 +1,34 @@
 // @ts-check
 
 /**
- * @typedef {import('../core/minesweeper/rules.js').MoveEvent} MnswprMoveEvent
+ * A recorded mnswpr move-log entry — the `@cozy-games/move-log` / ADR-002 §1
+ * envelope shape as instantiated by Minesweeper: a surfaced `type` discriminator
+ * plus an opaque `payload` carrying the move's `{ r, c }`. This is what the replay
+ * engine hands the reducers (the only fields they read).
+ *
+ * @typedef {{ type: string, payload: { r: number, c: number } }} MnswprRecord
  */
 
 /**
- * Map a recorded move-event back to the rules move that produced it: `flag` and
- * `unflag` are both the toggle move `flag`; `reveal` and `chord` pass through.
- * Unknown kinds are ignored. Shared by the mnswpr replay adapters (progress and
- * full-board state) so both replay a stream through the core rules identically.
+ * Map a recorded move-log entry back to the rules move that produced it: `flag`
+ * and `unflag` are both the toggle move `flag`; `reveal` and `chord` pass
+ * through. Unknown kinds are ignored. Shared by the mnswpr replay adapters
+ * (progress and full-board state) so both replay a stream through the core rules
+ * identically.
  *
- * @param {MnswprMoveEvent} e
+ * @param {MnswprRecord} record
  * @returns {{ type: 'reveal' | 'flag' | 'chord', r: number, c: number } | null}
  */
-export function toMove(e) {
-  switch (e && e.type) {
-    case 'reveal': return { type: 'reveal', r: e.r, c: e.c }
-    case 'chord': return { type: 'chord', r: e.r, c: e.c }
+export function toMove(record) {
+  if (!record) return null
+  const { type, payload } = record
+  const r = payload ? payload.r : 0
+  const c = payload ? payload.c : 0
+  switch (type) {
+    case 'reveal': return { type: 'reveal', r, c }
+    case 'chord': return { type: 'chord', r, c }
     case 'flag':
-    case 'unflag': return { type: 'flag', r: e.r, c: e.c }
+    case 'unflag': return { type: 'flag', r, c }
     default: return null
   }
 }
diff --git a/packages/mnswpr/adapters/replay-progress.d.ts b/packages/mnswpr/adapters/replay-progress.d.ts
index 65c29a3..c338e2c 100644
--- a/packages/mnswpr/adapters/replay-progress.d.ts
+++ b/packages/mnswpr/adapters/replay-progress.d.ts
@@ -1,5 +1,5 @@
 /**
- * @typedef {import('../core/minesweeper/rules.js').MoveEvent} MnswprMoveEvent
+ * @typedef {import('./replay-common.js').MnswprRecord} MnswprRecord
  * @typedef {import('../core/minesweeper/board.js').Layout} Layout
  */
 /**
@@ -10,18 +10,17 @@
  * `revealed safe cells / total safe cells * 100`.
  *
  * Why it needs the board: a single `reveal` or `chord` event floods MANY cells,
- * but the recorded move-event only carries `{ type, r, c }` — not how many cells
- * opened. So the reducer takes the board as closure input (consistent with the
- * interface design) and replays the moves through the pure core rules. That makes
- * reveals flood, chords reveal via their (non-flagged) neighbors, and
- * flags/unflags only gate chords — never advancing progress themselves — with no
- * cell double-counted. The engine stays game-blind; all interpretation is here.
+ * but the recorded entry only carries the move's `type` + `{ r, c }` payload — not
+ * how many cells opened. So the reducer takes the board as closure input
+ * (consistent with the interface design) and replays the moves through the pure
+ * core rules. That makes reveals flood, chords reveal via their (non-flagged)
+ * neighbors, and flags/unflags only gate chords — never advancing progress
+ * themselves — with no cell double-counted. The engine stays game-blind; all
+ * interpretation is here.
  *
  * @param {Layout} layout - the recorded board (as produced by `generateBoard`)
- * @returns {(events: { event: MnswprMoveEvent }[]) => number} a reducer to `[0, 100]`
+ * @returns {(events: MnswprRecord[]) => number} a reducer to `[0, 100]`
  */
-export function createProgressReducer(layout: Layout): (events: {
-    event: MnswprMoveEvent;
-}[]) => number;
-export type MnswprMoveEvent = import("../core/minesweeper/rules.js").MoveEvent;
+export function createProgressReducer(layout: Layout): (events: MnswprRecord[]) => number;
+export type MnswprRecord = import("./replay-common.js").MnswprRecord;
 export type Layout = import("../core/minesweeper/board.js").Layout;
diff --git a/packages/mnswpr/adapters/replay-progress.js b/packages/mnswpr/adapters/replay-progress.js
index 26552c9..53e22ff 100644
--- a/packages/mnswpr/adapters/replay-progress.js
+++ b/packages/mnswpr/adapters/replay-progress.js
@@ -3,7 +3,7 @@ import { MinesweeperRules } from '../core/minesweeper/rules.js'
 import { toMove } from './replay-common.js'
 
 /**
- * @typedef {import('../core/minesweeper/rules.js').MoveEvent} MnswprMoveEvent
+ * @typedef {import('./replay-common.js').MnswprRecord} MnswprRecord
  * @typedef {import('../core/minesweeper/board.js').Layout} Layout
  */
 
@@ -15,15 +15,16 @@ import { toMove } from './replay-common.js'
  * `revealed safe cells / total safe cells * 100`.
  *
  * Why it needs the board: a single `reveal` or `chord` event floods MANY cells,
- * but the recorded move-event only carries `{ type, r, c }` — not how many cells
- * opened. So the reducer takes the board as closure input (consistent with the
- * interface design) and replays the moves through the pure core rules. That makes
- * reveals flood, chords reveal via their (non-flagged) neighbors, and
- * flags/unflags only gate chords — never advancing progress themselves — with no
- * cell double-counted. The engine stays game-blind; all interpretation is here.
+ * but the recorded entry only carries the move's `type` + `{ r, c }` payload — not
+ * how many cells opened. So the reducer takes the board as closure input
+ * (consistent with the interface design) and replays the moves through the pure
+ * core rules. That makes reveals flood, chords reveal via their (non-flagged)
+ * neighbors, and flags/unflags only gate chords — never advancing progress
+ * themselves — with no cell double-counted. The engine stays game-blind; all
+ * interpretation is here.
  *
  * @param {Layout} layout - the recorded board (as produced by `generateBoard`)
- * @returns {(events: { event: MnswprMoveEvent }[]) => number} a reducer to `[0, 100]`
+ * @returns {(events: MnswprRecord[]) => number} a reducer to `[0, 100]`
  */
 export function createProgressReducer(layout) {
   const totalSafe = layout.rows * layout.cols - layout.mines
@@ -32,7 +33,7 @@ export function createProgressReducer(layout) {
     if (totalSafe === 0) return 100
     let state = MinesweeperRules.fromLayout(layout)
     for (const record of events) {
-      const move = toMove(record.event)
+      const move = toMove(record)
       if (move) state = MinesweeperRules.apply(state, move).state
     }
     return (state.revealedSafe / totalSafe) * 100
diff --git a/packages/mnswpr/adapters/replay-state.d.ts b/packages/mnswpr/adapters/replay-state.d.ts
index 866d5be..854d453 100644
--- a/packages/mnswpr/adapters/replay-state.d.ts
+++ b/packages/mnswpr/adapters/replay-state.d.ts
@@ -1,14 +1,14 @@
 /**
- * @typedef {import('../core/minesweeper/rules.js').MoveEvent} MnswprMoveEvent
+ * @typedef {import('./replay-common.js').MnswprRecord} MnswprRecord
  * @typedef {import('../core/minesweeper/board.js').Layout} Layout
  * @typedef {{ mine: boolean, adjacent: number, status: 'hidden' | 'flagged' | 'revealed' }} BoardCell
  * @typedef {{ rows: number, cols: number, phase: string, revealedSafe: number, cells: BoardCell[][] }} BoardState
  */
 /**
  * The full-board state reducer for Minesweeper — mnswpr's implementation of the
- * replay engine's `StateReducer<MnswprMoveEvent, BoardState>` seam (replay-05).
- * Given the ordered slice of move-events played so far, it reconstructs the
- * COMPLETE board at that point: every cell's mine/adjacent/status plus the phase.
+ * replay engine's `StateReducer<BoardState>` seam (replay-05). Given the ordered
+ * slice of move-log entries played so far, it reconstructs the COMPLETE board at
+ * that point: every cell's mine/adjacent/status plus the phase.
  *
  * Like the progress reducer, it takes the board as closure input and replays the
  * moves through the pure core rules — so reveals flood, chords open their
@@ -17,12 +17,10 @@
  * any position and rebuild the board there.
  *
  * @param {Layout} layout - the recorded board (as produced by `generateBoard`)
- * @returns {(events: { event: MnswprMoveEvent }[]) => BoardState}
+ * @returns {(events: MnswprRecord[]) => BoardState}
  */
-export function createStateReducer(layout: Layout): (events: {
-    event: MnswprMoveEvent;
-}[]) => BoardState;
-export type MnswprMoveEvent = import("../core/minesweeper/rules.js").MoveEvent;
+export function createStateReducer(layout: Layout): (events: MnswprRecord[]) => BoardState;
+export type MnswprRecord = import("./replay-common.js").MnswprRecord;
 export type Layout = import("../core/minesweeper/board.js").Layout;
 export type BoardCell = {
     mine: boolean;
diff --git a/packages/mnswpr/adapters/replay-state.js b/packages/mnswpr/adapters/replay-state.js
index 27320fe..a4f0bed 100644
--- a/packages/mnswpr/adapters/replay-state.js
+++ b/packages/mnswpr/adapters/replay-state.js
@@ -3,7 +3,7 @@ import { MinesweeperRules } from '../core/minesweeper/rules.js'
 import { toMove } from './replay-common.js'
 
 /**
- * @typedef {import('../core/minesweeper/rules.js').MoveEvent} MnswprMoveEvent
+ * @typedef {import('./replay-common.js').MnswprRecord} MnswprRecord
  * @typedef {import('../core/minesweeper/board.js').Layout} Layout
  * @typedef {{ mine: boolean, adjacent: number, status: 'hidden' | 'flagged' | 'revealed' }} BoardCell
  * @typedef {{ rows: number, cols: number, phase: string, revealedSafe: number, cells: BoardCell[][] }} BoardState
@@ -11,9 +11,9 @@ import { toMove } from './replay-common.js'
 
 /**
  * The full-board state reducer for Minesweeper — mnswpr's implementation of the
- * replay engine's `StateReducer<MnswprMoveEvent, BoardState>` seam (replay-05).
- * Given the ordered slice of move-events played so far, it reconstructs the
- * COMPLETE board at that point: every cell's mine/adjacent/status plus the phase.
+ * replay engine's `StateReducer<BoardState>` seam (replay-05). Given the ordered
+ * slice of move-log entries played so far, it reconstructs the COMPLETE board at
+ * that point: every cell's mine/adjacent/status plus the phase.
  *
  * Like the progress reducer, it takes the board as closure input and replays the
  * moves through the pure core rules — so reveals flood, chords open their
@@ -22,13 +22,13 @@ import { toMove } from './replay-common.js'
  * any position and rebuild the board there.
  *
  * @param {Layout} layout - the recorded board (as produced by `generateBoard`)
- * @returns {(events: { event: MnswprMoveEvent }[]) => BoardState}
+ * @returns {(events: MnswprRecord[]) => BoardState}
  */
 export function createStateReducer(layout) {
   return function state(events) {
     let s = MinesweeperRules.fromLayout(layout)
     for (const record of events) {
-      const move = toMove(record.event)
+      const move = toMove(record)
       if (move) s = MinesweeperRules.apply(s, move).state
     }
     return toBoard(s)
diff --git a/packages/mnswpr/core/grid/grid.d.ts b/packages/mnswpr/core/grid/grid.d.ts
index 383e2f8..b55a51f 100644
--- a/packages/mnswpr/core/grid/grid.d.ts
+++ b/packages/mnswpr/core/grid/grid.d.ts
@@ -15,11 +15,24 @@ export class Grid<Cell> {
     cols: number;
     /** @type {Cell[]} */
     _cells: Cell[];
-    /** @returns {boolean} */
-    inBounds(r: any, c: any): boolean;
-    /** @returns {Cell} */
-    at(r: any, c: any): Cell;
-    set(r: any, c: any, cell: any): void;
+    /**
+     * @param {number} r
+     * @param {number} c
+     * @returns {boolean}
+     */
+    inBounds(r: number, c: number): boolean;
+    /**
+     * @param {number} r
+     * @param {number} c
+     * @returns {Cell}
+     */
+    at(r: number, c: number): Cell;
+    /**
+     * @param {number} r
+     * @param {number} c
+     * @param {Cell} cell
+     */
+    set(r: number, c: number, cell: Cell): void;
     /** @param {(cell: Cell, r: number, c: number) => void} fn */
     forEach(fn: (cell: Cell, r: number, c: number) => void): void;
     /**
diff --git a/packages/mnswpr/core/grid/grid.js b/packages/mnswpr/core/grid/grid.js
index fcfa2a0..bbc662d 100644
--- a/packages/mnswpr/core/grid/grid.js
+++ b/packages/mnswpr/core/grid/grid.js
@@ -26,16 +26,29 @@ export class Grid {
     }
   }
 
-  /** @returns {boolean} */
+  /**
+   * @param {number} r
+   * @param {number} c
+   * @returns {boolean}
+   */
   inBounds(r, c) {
     return r >= 0 && c >= 0 && r < this.rows && c < this.cols
   }
 
-  /** @returns {Cell} */
+  /**
+   * @param {number} r
+   * @param {number} c
+   * @returns {Cell}
+   */
   at(r, c) {
     return this._cells[r * this.cols + c]
   }
 
+  /**
+   * @param {number} r
+   * @param {number} c
+   * @param {Cell} cell
+   */
   set(r, c, cell) {
     this._cells[r * this.cols + c] = cell
   }
diff --git a/packages/mnswpr/core/minesweeper/reveal.js b/packages/mnswpr/core/minesweeper/reveal.js
index a104755..7735928 100644
--- a/packages/mnswpr/core/minesweeper/reveal.js
+++ b/packages/mnswpr/core/minesweeper/reveal.js
@@ -24,9 +24,11 @@ export function floodReveal(grid, startR, startC) {
   start.status = 'revealed'
   revealed.push({ r: startR, c: startC, adjacent: start.adjacent })
 
+  /** @type {[number, number][]} */
   const queue = [[startR, startC]]
   while (queue.length) {
-    const [r, c] = queue.shift()
+    // Safe: the `while (queue.length)` guard guarantees a value here.
+    const [r, c] = /** @type {[number, number]} */ (queue.shift())
     // Only blank cells propagate; numbers are a boundary.
     if (grid.at(r, c).adjacent !== 0) continue
     for (const [nr, nc] of eightWay(grid, r, c)) {
diff --git a/packages/mnswpr/core/minesweeper/rules.d.ts b/packages/mnswpr/core/minesweeper/rules.d.ts
index b01b49e..05f20d9 100644
--- a/packages/mnswpr/core/minesweeper/rules.d.ts
+++ b/packages/mnswpr/core/minesweeper/rules.d.ts
@@ -8,6 +8,8 @@
  * @typedef {{ seed: number, config: Config, grid: Grid<Cell>, phase: Phase, minesPlaced: boolean, revealedSafe: number }} State
  * @typedef {{ type: 'reveal', r: number, c: number } | { type: 'flag', r: number, c: number } | { type: 'chord', r: number, c: number }} Move
  * @typedef {object} Event
+ * @typedef {{ seed: number, config: Config, phase: Phase, minesPlaced: boolean, revealedSafe: number, grid: { rows: number, cols: number, cells: Cell[] } }} Snapshot
+ * @typedef {{ r: number, c: number, status: 'revealed', adjacent: number, mine: boolean } | { r: number, c: number, status: 'flagged' } | { r: number, c: number, status: 'hidden', mine: true }} ProjectedCell
  */
 /**
  * The typed move-event vocabulary emitted by the session (one per effective
@@ -23,12 +25,78 @@
  */
 /** The move-event vocabulary as runtime data (the `MoveEvent` `type` domain). */
 export const MOVE_EVENT_TYPES: readonly ["reveal", "flag", "unflag", "chord"];
-/**
- * The GameRules contract consumed by GameSession/replay: init / apply / status /
- * project, plus serialize / deserialize for snapshotting. Deterministic and
- * DOM-free.
- */
-export const MinesweeperRules: any;
+export namespace MinesweeperRules {
+    /**
+     * @param {number} seed
+     * @param {Config} config
+     * @returns {State}
+     */
+    export function init(seed: number, config: Config): State;
+    /**
+     * Build a game state from an explicit, pre-built layout (as returned by
+     * `generateBoard`) instead of generating one from a seed. Parallel to
+     * {@link init}: it yields a `State` a `GameSession` can drive identically —
+     * same rules, same transitions — the only difference being that the board is
+     * fixed up front, so the opening reveal is NOT made safe (first-click safety is
+     * a property of internal generation, not of a caller-supplied board). The
+     * layout is validated first and a malformed one throws.
+     *
+     * @param {import('./board.js').Layout} layout
+     * @param {{ seed?: number }} [opts] - seed is metadata only (no generation happens); defaults to 0
+     * @returns {State}
+     */
+    export function fromLayout(layout: import("./board.js").Layout, { seed }?: {
+        seed?: number;
+    }): State;
+    /** @param {State} state @returns {Phase} */
+    export function status(state: State): Phase;
+    /**
+     * Fold a move into the state. Terminal states are absorbing.
+     * @param {State} state
+     * @param {Move} move
+     * @returns {{ state: State, events: Event[] }}
+     */
+    export function apply(state: State, move: Move): {
+        state: State;
+        events: Event[];
+    };
+    export { project };
+    /**
+     * Classify an applied move into a typed move-event kind, or `null` if the move
+     * was a no-op (the rules produced no events — e.g. clicking a revealed cell).
+     * The session stamps the returned `{ type, r, c }` with `t` and `seq`. This is
+     * the seam that turns a raw `Move` into the {@link MoveEvent} vocabulary and,
+     * critically, splits a `flag` move into `flag`/`unflag` by its outcome.
+     *
+     * @param {Move} move
+     * @param {Event[]} events - the rules events this move produced
+     * @returns {{ type: MoveEventType, r: number, c: number } | null}
+     */
+    export function toMoveEvent(move: Move, events: Event[]): {
+        type: MoveEventType;
+        r: number;
+        c: number;
+    } | null;
+    /**
+     * Snapshot a game state as a plain, JSON-safe object: the whole board (every
+     * cell's mine/adjacent/status, via the Layer-0 grid serializer) plus phase and
+     * progress. Inverse of {@link deserialize}. The `grid` instance is the only
+     * non-JSON-safe field of `State`; everything else (seed, config, flags) is
+     * already plain data.
+     *
+     * @param {State} state
+     * @returns {Snapshot}
+     */
+    export function serialize(state: State): Snapshot;
+    /**
+     * Rebuild a game state from {@link serialize} output (or its JSON round-trip).
+     * Cells are cloned so the revived state shares no references with the snapshot.
+     *
+     * @param {Snapshot} snap
+     * @returns {State}
+     */
+    export function deserialize(snap: Snapshot): State;
+}
 /**
  * Minesweeper as a pure, deterministic state machine — no DOM, no wall clock.
  * `GameSession` (Layer 1) drives it; the client renders the events it emits.
@@ -78,6 +146,42 @@ export type Move = {
  * `GameSession` (Layer 1) drives it; the client renders the events it emits.
  */
 export type Event = object;
+/**
+ * Minesweeper as a pure, deterministic state machine — no DOM, no wall clock.
+ * `GameSession` (Layer 1) drives it; the client renders the events it emits.
+ */
+export type Snapshot = {
+    seed: number;
+    config: Config;
+    phase: Phase;
+    minesPlaced: boolean;
+    revealedSafe: number;
+    grid: {
+        rows: number;
+        cols: number;
+        cells: Cell[];
+    };
+};
+/**
+ * Minesweeper as a pure, deterministic state machine — no DOM, no wall clock.
+ * `GameSession` (Layer 1) drives it; the client renders the events it emits.
+ */
+export type ProjectedCell = {
+    r: number;
+    c: number;
+    status: "revealed";
+    adjacent: number;
+    mine: boolean;
+} | {
+    r: number;
+    c: number;
+    status: "flagged";
+} | {
+    r: number;
+    c: number;
+    status: "hidden";
+    mine: true;
+};
 /**
  * The typed move-event vocabulary emitted by the session (one per effective
  * move). This is the game's public event language — consumed later by the shared
@@ -104,4 +208,19 @@ export type MoveEvent = {
     t: number;
     seq: number;
 };
+/**
+ * Project full state down to what a client is allowed to know: revealed cells
+ * (+ their adjacency), flags, and — only once the game is over — the mines. An
+ * unrevealed mine is NEVER included mid-game, so this is safe to send over a wire
+ * (invariant #3). Hidden, unrevealed, non-mine cells are simply omitted.
+ *
+ * @param {State} state
+ * @returns {{ config: Config, phase: Phase, cells: ProjectedCell[] }}
+ */
+declare function project(state: State): {
+    config: Config;
+    phase: Phase;
+    cells: ProjectedCell[];
+};
 import { Grid } from '../grid/grid.js';
+export {};
diff --git a/packages/mnswpr/core/minesweeper/rules.js b/packages/mnswpr/core/minesweeper/rules.js
index 56e6238..4f8bb20 100644
--- a/packages/mnswpr/core/minesweeper/rules.js
+++ b/packages/mnswpr/core/minesweeper/rules.js
@@ -15,6 +15,8 @@ import { floodReveal, countFlagsAround, allMines } from './reveal.js'
  * @typedef {{ seed: number, config: Config, grid: Grid<Cell>, phase: Phase, minesPlaced: boolean, revealedSafe: number }} State
  * @typedef {{ type: 'reveal', r: number, c: number } | { type: 'flag', r: number, c: number } | { type: 'chord', r: number, c: number }} Move
  * @typedef {object} Event
+ * @typedef {{ seed: number, config: Config, phase: Phase, minesPlaced: boolean, revealedSafe: number, grid: { rows: number, cols: number, cells: Cell[] } }} Snapshot
+ * @typedef {{ r: number, c: number, status: 'revealed', adjacent: number, mine: boolean } | { r: number, c: number, status: 'flagged' } | { r: number, c: number, status: 'hidden', mine: true }} ProjectedCell
  */
 
 /**
@@ -171,9 +173,11 @@ function chord(state, r, c) {
  * (invariant #3). Hidden, unrevealed, non-mine cells are simply omitted.
  *
  * @param {State} state
+ * @returns {{ config: Config, phase: Phase, cells: ProjectedCell[] }}
  */
 function project(state) {
   const terminal = state.phase === 'won' || state.phase === 'lost'
+  /** @type {ProjectedCell[]} */
   const cells = []
   state.grid.forEach((cell, r, c) => {
     if (cell.status === 'revealed') cells.push({ r, c, status: 'revealed', adjacent: cell.adjacent, mine: cell.mine })
@@ -291,7 +295,7 @@ export const MinesweeperRules = {
    * already plain data.
    *
    * @param {State} state
-   * @returns {{ seed: number, config: Config, phase: Phase, minesPlaced: boolean, revealedSafe: number, grid: { rows: number, cols: number, cells: Cell[] } }}
+   * @returns {Snapshot}
    */
   serialize(state) {
     return {
@@ -308,7 +312,7 @@ export const MinesweeperRules = {
    * Rebuild a game state from {@link serialize} output (or its JSON round-trip).
    * Cells are cloned so the revived state shares no references with the snapshot.
    *
-   * @param {ReturnType<typeof MinesweeperRules.serialize>} snap
+   * @param {Snapshot} snap
    * @returns {State}
    */
   deserialize(snap) {
diff --git a/packages/mnswpr/package.json b/packages/mnswpr/package.json
index 658e551..f06600b 100644
--- a/packages/mnswpr/package.json
+++ b/packages/mnswpr/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@cozy-games/mnswpr",
-  "version": "0.4.36",
+  "version": "0.5.0",
   "description": "Classic Minesweeper browser game",
   "author": "Ayo",
   "type": "module",
diff --git a/packages/mnswpr/test/replay-progress.test.js b/packages/mnswpr/test/replay-progress.test.js
index 9347ffb..f0be5c0 100644
--- a/packages/mnswpr/test/replay-progress.test.js
+++ b/packages/mnswpr/test/replay-progress.test.js
@@ -9,7 +9,7 @@ function record(layout, moves) {
   const events = []
   session.onMove(e => events.push(e))
   for (const m of moves) session.applyMove(m)
-  return { events: events.map(event => ({ seq: event.seq, t: event.t, event })), session }
+  return { events: events.map(event => ({ seq: event.seq, clientTs: event.t, type: event.type, payload: { r: event.r, c: event.c } })), session }
 }
 
 // 3x3, single mine at (0,0); adjacency computed. Total safe = 8.
@@ -33,7 +33,7 @@ describe('mnswpr progress reducer (percent-cleared)', () => {
 
     const session = new GameSession(MinesweeperRules, { state: MinesweeperRules.fromLayout(layout) })
     const events = []
-    session.onMove(e => events.push({ seq: e.seq, t: e.t, event: e }))
+    session.onMove(e => events.push({ seq: e.seq, clientTs: e.t, type: e.type, payload: { r: e.r, c: e.c } }))
     for (let r = 0; r < 9; r++) {
       for (let c = 0; c < 9; c++) {
         if (!session.state.grid.at(r, c).mine) session.applyMove({ type: 'reveal', r, c })
@@ -72,7 +72,7 @@ describe('mnswpr progress reducer (percent-cleared)', () => {
       { type: 'flag', r: 0, c: 0 },   // flag the mine
       { type: 'flag', r: 0, c: 0 }    // unflag it
     ])
-    expect(events.map(e => e.event.type)).toEqual(['reveal', 'flag', 'unflag'])
+    expect(events.map(e => e.type)).toEqual(['reveal', 'flag', 'unflag'])
 
     const afterReveal = progress(events.slice(0, 1))
     expect(afterReveal).toBeCloseTo(12.5, 5) // 1 / 8
@@ -90,7 +90,7 @@ describe('mnswpr progress reducer (percent-cleared)', () => {
       { type: 'flag', r: 0, c: 0 },
       { type: 'chord', r: 0, c: 1 }
     ])
-    expect(events.map(e => e.event.type)).toEqual(['reveal', 'flag', 'chord'])
+    expect(events.map(e => e.type)).toEqual(['reveal', 'flag', 'chord'])
 
     expect(progress(events.slice(0, 1))).toBeCloseTo(12.5, 5) // 1/8 after reveal
     expect(progress(events.slice(0, 2))).toBeCloseTo(12.5, 5) // flag doesn't advance
diff --git a/packages/mnswpr/test/replay-state.test.js b/packages/mnswpr/test/replay-state.test.js
index a62f77d..267191f 100644
--- a/packages/mnswpr/test/replay-state.test.js
+++ b/packages/mnswpr/test/replay-state.test.js
@@ -8,7 +8,7 @@ function record(layout, moves) {
   const events = []
   session.onMove(e => events.push(e))
   for (const m of moves) session.applyMove(m)
-  return { events: events.map(event => ({ seq: event.seq, t: event.t, event })), session }
+  return { events: events.map(event => ({ seq: event.seq, clientTs: event.t, type: event.type, payload: { r: event.r, c: event.c } })), session }
 }
 
 // 3x3, single mine at (0,0). Total safe = 8.
diff --git a/packages/move-log/CHANGELOG.md b/packages/move-log/CHANGELOG.md
new file mode 100644
index 0000000..2777425
--- /dev/null
+++ b/packages/move-log/CHANGELOG.md
@@ -0,0 +1,41 @@
+# Changelog
+
+## 0.1.0 — envelope realigned to ADR-002 §1 (BREAKING, pre-freeze)
+
+**Intentional breaking change.** Safe now because no production logs have been
+recorded yet (the downstream consumer, cozy-platform, ships dark pre-cutover).
+Once real games write logs the format is permanent, so this had to land first.
+
+The envelope now matches cozy-games **ADR-002 §1** and the cozy-platform
+implementation that proved it (S0-102 round-trip replay) — **while keeping the
+generics** that let a second game reuse the package untouched:
+
+- **Entry shape:** `{ seq, t, event: T }` → `{ seq, clientTs, type, payload, receivedTs? }`.
+  The game event splits into the ADR's surfaced `type` **discriminator** plus an
+  OPAQUE `payload`. (`t` → `clientTs`.) `receivedTs?` is unchanged (optional, additive).
+- **Generics kept & strengthened:** `MoveEvent<T>` / `MoveLog<T>` →
+  `MoveEvent<TType extends string = string, TPayload = unknown>` /
+  `MoveLog<TType extends string = string, TPayload = unknown>`. Minesweeper
+  instantiates `MoveLog<'reveal'|'flag'|'unflag'|'chord', { r, c }>`; a second game
+  supplies its own params with no package change. The defaults give game-blind
+  code the erased (`string` / `unknown`) form. Shipped as generic `.d.ts`.
+- **`schema_version`:** package-owned number `1` → a **caller-supplied string**
+  naming the game's move-event vocabulary (e.g. `"mnswpr-moves/1"`), carried
+  verbatim (ADR §2). The `SCHEMA_VERSION` export and the numeric container-version
+  concept are removed.
+- **`createMoveLog(schemaVersion, events?)`** now takes the vocabulary version as
+  its first argument.
+- **`assertMoveLog`** enforces the new invariants (non-empty string
+  `schema_version`; integer strictly-increasing `seq`; finite `clientTs`;
+  non-empty string `type`; **present** `payload` — any value, never inspected;
+  finite `receivedTs` when present) and still rejects without mutating.
+
+Helpers (`isMoveLog`, `serializeMoveLog`, `deserializeMoveLog`, `withReceivedTs`)
+are kept and adapted; the JSON round-trip stays lossless. The package remains
+game-agnostic (imports no game types, never inspects `payload`, treats `type` as
+an opaque non-empty string).
+
+## 0.0.1
+
+Initial workspace release: `{ seq, t, event }` entries with a numeric,
+package-owned `schema_version: 1`.
diff --git a/packages/move-log/README.md b/packages/move-log/README.md
index 183b7f6..46a4da1 100644
--- a/packages/move-log/README.md
+++ b/packages/move-log/README.md
@@ -1,62 +1,112 @@
 # @cozy-games/move-log
 
-A **game-agnostic** container for a recorded run of move events. It wraps any game's event stream in a schema-versioned, ordered, timestamped log.
+A **game-agnostic** container for a recorded run of move events — the generic
+envelope of cozy-games **ADR-002 §1**. It wraps any game's move stream in a
+schema-versioned, ordered log of `{ seq, clientTs, type, payload }` entries and
+never looks inside a `payload`.
 
 ```js
 import {
   createMoveLog, withReceivedTs,
-  serializeMoveLog, deserializeMoveLog, isMoveLog, SCHEMA_VERSION
+  serializeMoveLog, deserializeMoveLog, isMoveLog, assertMoveLog
 } from '@cozy-games/move-log'
 
-// `T` is your game's own event vocabulary — supplied by you, unknown to us.
-const log = createMoveLog([
-  { seq: 1, t: 0, event: { type: 'reveal', r: 0, c: 0 } },
-  { seq: 2, t: 50, event: { type: 'flag', r: 1, c: 2 } }
+// The first argument is YOUR game's move-event vocabulary version — a string,
+// carried verbatim. `type` names a move in that vocabulary; `payload` is your
+// game's opaque move data (never inspected here).
+const log = createMoveLog('mnswpr-moves/1', [
+  { seq: 1, clientTs: 0,  type: 'reveal', payload: { r: 0, c: 0 } },
+  { seq: 2, clientTs: 50, type: 'flag',   payload: { r: 1, c: 2 } }
 ])
-// → { schema_version: 1, events: [ { seq, t, event }, ... ] }
+// → { schema_version: 'mnswpr-moves/1', events: [ { seq, clientTs, type, payload }, ... ] }
 
 const json = serializeMoveLog(log)          // → JSON string
 const restored = deserializeMoveLog(json)    // → validated MoveLog, or throws
 
 // A consumer records WHEN it received events (host clock), additively:
 const stamped = withReceivedTs(restored, () => hostNow())
-// → each event now also carries `receivedTs`; still a valid v1 log
+// → each event now also carries `receivedTs`; still a valid log
 ```
 
-## Shape
+## Shape — generic over the game
 
-| field            | type              | meaning                                            |
-| ---------------- | ----------------- | -------------------------------------------------- |
-| `schema_version` | `1`               | the move-log container version                     |
-| `events`         | `MoveEvent<T>[]`  | ordered, each `{ seq, t, event, receivedTs? }`     |
+```ts
+// Parameterized over the game's move-event discriminator and payload, with
+// defaults so game-blind code can use the erased (string / unknown) form.
+interface MoveEvent<TType extends string = string, TPayload = unknown> {
+  seq: number         // integer, STRICTLY INCREASING (starts at 1, survives resume) — log metadata
+  clientTs: number    // finite ms timestamp (client clock) — log metadata
+  type: TType         // the game's move-event discriminator (ADR §1: `type: T`)
+  payload: TPayload   // game-specific move data — OPAQUE to the package (never inspected)
+  receivedTs?: number // OPTIONAL, additive: consumer-side receipt time
+}
 
-`MoveEvent<T> = { seq: number, t: number, event: T, receivedTs?: number }` — the
-log owns the per-event recording metadata (a strictly increasing `seq`, a
-source-side timestamp `t`, and an **optional** received-side `receivedTs`), so
-`T` stays a pure game payload with no required shape. `receivedTs` is
-purpose-neutral: it records only *that* a consumer received the event at some
-time, never why or from where.
+interface MoveLog<TType extends string = string, TPayload = unknown> {
+  schema_version: string   // the GAME's move-event vocabulary version, verbatim
+  events: MoveEvent<TType, TPayload>[]
+}
+```
 
-`deserializeMoveLog` round-trips a serialized log with full fidelity (order,
-timestamps, sequence numbers, and any `receivedTs`) and rejects malformed input —
-bad JSON, missing or wrong-typed fields, or non-monotonic `seq` — with a clear
-error, never returning a partially-parsed log.
+The move splits into a surfaced `type` **discriminator** plus an **opaque**
+`payload` — exactly ADR-002 §1 — so game-agnostic tooling (progress overlays,
+analytics, log inspection) can key off the event *kind* without a game adapter,
+while the package never looks inside `payload` and treats `type` only as an
+opaque non-empty string. The log owns the recording metadata (`seq`, `clientTs`,
+and an optional `receivedTs`); the game owns `type` + `payload`.
 
-## Versioning: `receivedTs` is additive within `schema_version: 1`
+**Genericness is the point:** a second game reuses this package with **zero
+changes** — it just instantiates its own vocabulary. Minesweeper uses
+`MoveLog<'reveal' | 'flag' | 'unflag' | 'chord', { r: number; c: number }>`; the
+defaults give persistence/routing code a usable `MoveLog` with `type: string` +
+opaque `payload`.
 
-`receivedTs` was added **without** bumping `schema_version`. It is optional and
-purely additive: a v1 log is valid whether every event, some events, or no
-events carry a `receivedTs`, and a reader that doesn't know the field simply
-ignores it. A version bump is reserved for *breaking* container changes (a
-renamed/removed field or a newly required one), which would be dispatched on in
-`deserializeMoveLog`. See the `SCHEMA_VERSION` doc comment for the full policy.
+```js
+/** @type {import('@cozy-games/move-log').MoveLog<'a' | 'b', { x: number }>} */
+const log = createMoveLog('made-up-game/1', [
+  { seq: 1, clientTs: 0, type: 'a', payload: { x: 1 } }
+])
+```
+
+`.d.ts` declarations ship with the package (generated from the JSDoc), so
+consumers get the exact generic `MoveEvent` / `MoveLog` types with no ambient
+stand-in.
+
+## `schema_version` is the game's vocabulary version — a string, verbatim
+
+Per ADR-002 §2, *"the event vocabulary and log `schema_version` live in the
+game's package."* The version identifies the **game's move-event vocabulary**
+(e.g. `"mnswpr-moves/1"`), supplied by the caller and carried **verbatim** so a
+reader of a forever-stored log always knows how to replay it. This package owns
+no version of its own and never rewrites the one you pass. `receivedTs` remains
+optional and additive — a log is valid whether every event, some events, or no
+events carry it, and a reader that doesn't know the field simply ignores it.
+
+## API
+
+- `createMoveLog(schemaVersion, events?)` — stamp `schema_version` with the
+  supplied string verbatim, copy the events (no aliasing), validate, return the log.
+- `assertMoveLog(value)` — throw a distinct, field-specific error on any
+  violation; return the log otherwise. **Reject, never repair** (no mutation,
+  truncation, or coercion).
+- `isMoveLog(value)` — non-throwing wrapper around `assertMoveLog`.
+- `serializeMoveLog(log)` / `deserializeMoveLog(json)` — lossless JSON round-trip
+  (order, `seq`, `clientTs`, `type`, `payload`, `receivedTs`); rejects malformed
+  input, never returning a partially-parsed log.
+- `withReceivedTs(log, stamp)` — return a new log with a received-side timestamp
+  attached to each event for which `stamp` returns a finite number; input untouched.
+
+### Invariants enforced by `assertMoveLog`
+
+`schema_version` is a non-empty string; `events` is an array; every entry is a
+plain object with an **integer, strictly-increasing** `seq`, a **finite**
+`clientTs`, a **non-empty string** `type`, and a **plain-object** `payload` (not
+an array or `null`); `receivedTs` is finite when present.
 
 ## Invariant: zero game-specific imports
 
 This module **must never import a game package** (e.g. mnswpr) or any game
-vocabulary. `T` is always supplied by the consumer; the log only ever sees
-opaque payloads. This independence is the whole point — it lets one move-log
-format serve every game.
-
-The rule is enforced by a dependency-graph guard in `test/move-log.test.js`
-(scans the package's source and manifest for game references). Keep it green.
+vocabulary. `type`/`payload` are always supplied by the consumer; the log only
+ever sees opaque payloads. This independence is the whole point — it lets one
+move-log format serve every game. The rule is enforced by a dependency-graph
+guard in `test/move-log.test.js` (scans the package's source and manifest for
+game references). Keep it green.
diff --git a/packages/move-log/index.d.ts b/packages/move-log/index.d.ts
index 7c0e8d9..6ad3817 100644
--- a/packages/move-log/index.d.ts
+++ b/packages/move-log/index.d.ts
@@ -1,23 +1,27 @@
 /**
- * Assert a value is a well-formed move log — correct `schema_version` and a valid
- * events array — throwing a clear, specific error otherwise. Returns the value
- * (typed) for chaining; never mutates.
+ * Assert a value is a well-formed move log — a non-empty string `schema_version`
+ * and a valid events array — throwing a clear, specific error otherwise. Returns
+ * the value (typed as the erased, game-blind form) for chaining; never mutates.
  *
  * @param {unknown} value
- * @returns {MoveLog<any>}
+ * @returns {MoveLog}
  */
-export function assertMoveLog(value: unknown): MoveLog<any>;
+export function assertMoveLog(value: unknown): MoveLog;
 /**
- * Build a move log from an ordered list of `{ seq, t, event }` records. Pure and
+ * Build a move log for a game's move-event vocabulary. `schemaVersion` names that
+ * vocabulary (e.g. `"mnswpr-moves/1"`) and is stored verbatim. Pure and
  * game-agnostic: it validates only the log's own invariants (metadata types and
- * strictly increasing `seq`), never the shape of `T`. Order is preserved and
- * entries are copied, so the log never aliases the caller's array.
+ * strictly increasing `seq`), never the shape of a `payload`. Order is preserved
+ * and entries are copied, so the log never aliases the caller's array. Generic
+ * over the game — infers `TType`/`TPayload` from `events`.
  *
- * @template T
- * @param {MoveEvent<T>[]} [events] - ordered events, each `{ seq, t, event, receivedTs? }`
- * @returns {MoveLog<T>}
+ * @template {string} [TType=string]
+ * @template [TPayload=unknown]
+ * @param {string} schemaVersion - the game's move-event vocabulary version, stored verbatim
+ * @param {MoveEvent<TType, TPayload>[]} [events] - ordered entries, each `{ seq, clientTs, type, payload, receivedTs? }`
+ * @returns {MoveLog<TType, TPayload>}
  */
-export function createMoveLog<T>(events?: MoveEvent<T>[]): MoveLog<T>;
+export function createMoveLog<TType extends string = string, TPayload = unknown>(schemaVersion: string, events?: MoveEvent<TType, TPayload>[]): MoveLog<TType, TPayload>;
 /**
  * Return a new move log with a received-side timestamp attached to each event
  * for which `stamp` returns a finite number; events where `stamp` returns
@@ -25,15 +29,16 @@ export function createMoveLog<T>(events?: MoveEvent<T>[]): MoveLog<T>;
  * consumer records WHEN it received events — the log never cares where the value
  * came from. Pure: the input log is not mutated.
  *
- * @template T
- * @param {MoveLog<T>} log
- * @param {(event: MoveEvent<T>, index: number) => number | undefined} stamp
- * @returns {MoveLog<T>}
+ * @template {string} TType
+ * @template TPayload
+ * @param {MoveLog<TType, TPayload>} log
+ * @param {(event: MoveEvent<TType, TPayload>, index: number) => number | undefined} stamp
+ * @returns {MoveLog<TType, TPayload>}
  */
-export function withReceivedTs<T>(log: MoveLog<T>, stamp: (event: MoveEvent<T>, index: number) => number | undefined): MoveLog<T>;
+export function withReceivedTs<TType extends string, TPayload>(log: MoveLog<TType, TPayload>, stamp: (event: MoveEvent<TType, TPayload>, index: number) => number | undefined): MoveLog<TType, TPayload>;
 /**
- * Non-throwing type guard: is `value` a well-formed move log of the current
- * schema version? Checks the container invariants only — remains blind to `T`.
+ * Non-throwing type guard: is `value` a well-formed move log? Checks the
+ * container invariants only — remains blind to each `payload`.
  *
  * @param {unknown} value
  * @returns {boolean}
@@ -43,81 +48,50 @@ export function isMoveLog(value: unknown): boolean;
  * Serialize a move log to a JSON string. Validates first, so a malformed log is
  * rejected here rather than emitted. Inverse of {@link deserializeMoveLog}.
  *
- * @template T
- * @param {MoveLog<T>} log
+ * @template {string} TType
+ * @template TPayload
+ * @param {MoveLog<TType, TPayload>} log
  * @returns {string}
  */
-export function serializeMoveLog<T>(log: MoveLog<T>): string;
+export function serializeMoveLog<TType extends string, TPayload>(log: MoveLog<TType, TPayload>): string;
 /**
  * Parse and validate a JSON string into a move log, with full fidelity: event
- * order, timestamps, and sequence numbers survive the round-trip exactly.
- * Rejects malformed input (bad JSON, missing/typed-wrong fields, non-monotonic
- * `seq`) with a clear error and NEVER returns a partially-parsed log. Inverse of
- * {@link serializeMoveLog}.
+ * order, `seq`, `clientTs`, `type`, `payload`, and any `receivedTs` survive the
+ * round-trip exactly. Rejects malformed input (bad JSON, missing/typed-wrong
+ * fields, non-monotonic `seq`) with a clear error and NEVER returns a
+ * partially-parsed log. Inverse of {@link serializeMoveLog}.
  *
  * @param {string} json
- * @returns {MoveLog<any>}
+ * @returns {MoveLog}
  */
-export function deserializeMoveLog(json: string): MoveLog<any>;
+export function deserializeMoveLog(json: string): MoveLog;
 /**
- * `@cozy-games/move-log` — a game-agnostic container for a recorded run of move
- * events. It wraps ANY game's event stream: `T` is the consuming game's own
- * event vocabulary (mnswpr's `MoveEvent` union from core-06 is the first `T`),
- * supplied by the caller.
+ * A single recorded move event — the log-owned recording metadata plus the
+ * game's surfaced `type` + opaque `payload`:
  *
- * This module imports NO game types — that independence is the whole point and
- * is enforced by a dependency-graph guard in the tests. The log owns the
- * per-event recording metadata (`seq` + `t`, and an optional received-side
- * `receivedTs`) so `T` can stay a pure game payload with no required shape; the
- * module never inspects the inside of an `event`.
+ * - `seq` — integer, STRICTLY INCREASING across the log (starts at 1, survives resume).
+ * - `clientTs` — finite millisecond timestamp from the client clock.
+ * - `type` — the game's move-event discriminator (ADR §1 `type: T`); a non-empty string.
+ * - `payload` — game-specific move data; OPAQUE to the package (never inspected).
+ * - `receivedTs` — OPTIONAL, additive: a consumer-side receipt time (finite ms).
  *
- * Extraction to a standalone published package comes later; for now it lives as
- * a shared workspace module alongside `packages/utils`.
+ * Generic over the game's discriminator `TType` and payload `TPayload`, with
+ * defaults so game-blind code can use the erased form.
  */
-/**
- * The move-log schema version.
- *
- * Versioning policy: OPTIONAL, purely additive fields (an event gaining an
- * optional `receivedTs`, say) do NOT bump this — a v1 reader ignores fields it
- * doesn't know, and a log written with them stays a valid v1 log. Bump ONLY on a
- * breaking change to the container shape (a renamed/removed field, a newly
- * *required* field), which would need dispatch on read. Never bump for changes
- * to a game's `T` vocabulary.
- *
- * @typedef {1} SchemaVersion
- */
-export const SCHEMA_VERSION: SchemaVersion;
-/**
- * A single recorded event: the log-owned recording metadata — a strictly
- * increasing sequence number `seq`, a source-side timestamp `t` (milliseconds),
- * and an OPTIONAL received-side timestamp `receivedTs` a consumer may attach when
- * it received the event — plus the game's opaque payload `event`. Generic over
- * the game's event type `T`. `receivedTs` is purpose-neutral: the log records
- * only THAT it was received at some time, never why or from where.
- */
-export type MoveEvent<T> = {
+export type MoveEvent<TType extends string = string, TPayload = unknown> = {
     seq: number;
-    t: number;
-    event: T;
+    clientTs: number;
+    type: TType;
+    payload: TPayload;
     receivedTs?: number;
 };
 /**
- * The container: a schema-versioned, ordered array of timestamped, sequenced
- * events for one recorded run. Generic over the game's event vocabulary `T`.
- * JSON-safe as long as `T` is.
+ * The container: a schema-versioned, ordered array of recorded entries for one
+ * run. `schema_version` is the game's move-event vocabulary version, verbatim.
+ * Generic over the game (same parameters as {@link MoveEvent}); JSON-safe as long
+ * as every `payload` is.
  */
-export type MoveLog<T> = {
-    schema_version: SchemaVersion;
-    events: MoveEvent<T>[];
+export type MoveLog<TType extends string = string, TPayload = unknown> = {
+    schema_version: string;
+    events: MoveEvent<TType, TPayload>[];
 };
-/**
- * The move-log schema version.
- *
- * Versioning policy: OPTIONAL, purely additive fields (an event gaining an
- * optional `receivedTs`, say) do NOT bump this — a v1 reader ignores fields it
- * doesn't know, and a log written with them stays a valid v1 log. Bump ONLY on a
- * breaking change to the container shape (a renamed/removed field, a newly
- * *required* field), which would need dispatch on read. Never bump for changes
- * to a game's `T` vocabulary.
- */
-export type SchemaVersion = 1;
diff --git a/packages/move-log/index.js b/packages/move-log/index.js
index 7c0bf6c..f438e07 100644
--- a/packages/move-log/index.js
+++ b/packages/move-log/index.js
@@ -2,60 +2,78 @@
 
 /**
  * `@cozy-games/move-log` — a game-agnostic container for a recorded run of move
- * events. It wraps ANY game's event stream: `T` is the consuming game's own
- * event vocabulary (mnswpr's `MoveEvent` union from core-06 is the first `T`),
- * supplied by the caller.
+ * events, implementing the generic envelope of cozy-games ADR-002 §1.
  *
- * This module imports NO game types — that independence is the whole point and
- * is enforced by a dependency-graph guard in the tests. The log owns the
- * per-event recording metadata (`seq` + `t`, and an optional received-side
- * `receivedTs`) so `T` can stay a pure game payload with no required shape; the
- * module never inspects the inside of an `event`.
+ * Each recorded entry is `{ seq, clientTs, type, payload }` (+ an optional,
+ * additive `receivedTs`): the log-owned recording metadata plus a surfaced move
+ * `type` discriminator (a string naming a member of the consuming game's
+ * move-event vocabulary) and an OPAQUE `payload` carrying that game's move data.
  *
- * Extraction to a standalone published package comes later; for now it lives as
- * a shared workspace module alongside `packages/utils`.
+ * The container is **generic over the game** — `MoveEvent<TType, TPayload>` and
+ * `MoveLog<TType, TPayload>` are parameterized so a second game reuses this
+ * package with ZERO changes: Minesweeper instantiates
+ * `MoveLog<'reveal'|'flag'|'unflag'|'chord', { r: number, c: number }>`; another
+ * game supplies its own `TType`/`TPayload`. The defaults (`string`, `unknown`)
+ * give game-blind persistence/routing/inspection code a usable erased form. At
+ * runtime the package imports NO game types, never inspects the inside of a
+ * `payload`, and treats `type` only as an opaque non-empty string — independence
+ * enforced by a dependency-graph guard in the tests.
+ *
+ * The container carries a `schema_version`: a caller-supplied STRING identifying
+ * the game's frozen move-event vocabulary (e.g. `"mnswpr-moves/1"`), stored
+ * verbatim so a reader of a forever-stored log always knows how to replay it (ADR
+ * §2). The package owns no version of its own.
  */
 
 /**
- * The move-log schema version.
+ * A single recorded move event — the log-owned recording metadata plus the
+ * game's surfaced `type` + opaque `payload`:
  *
- * Versioning policy: OPTIONAL, purely additive fields (an event gaining an
- * optional `receivedTs`, say) do NOT bump this — a v1 reader ignores fields it
- * doesn't know, and a log written with them stays a valid v1 log. Bump ONLY on a
- * breaking change to the container shape (a renamed/removed field, a newly
- * *required* field), which would need dispatch on read. Never bump for changes
- * to a game's `T` vocabulary.
+ * - `seq` — integer, STRICTLY INCREASING across the log (starts at 1, survives resume).
+ * - `clientTs` — finite millisecond timestamp from the client clock.
+ * - `type` — the game's move-event discriminator (ADR §1 `type: T`); a non-empty string.
+ * - `payload` — game-specific move data; OPAQUE to the package (never inspected).
+ * - `receivedTs` — OPTIONAL, additive: a consumer-side receipt time (finite ms).
  *
- * @typedef {1} SchemaVersion
- */
-export const SCHEMA_VERSION = /** @type {SchemaVersion} */ (1)
-
-/**
- * A single recorded event: the log-owned recording metadata — a strictly
- * increasing sequence number `seq`, a source-side timestamp `t` (milliseconds),
- * and an OPTIONAL received-side timestamp `receivedTs` a consumer may attach when
- * it received the event — plus the game's opaque payload `event`. Generic over
- * the game's event type `T`. `receivedTs` is purpose-neutral: the log records
- * only THAT it was received at some time, never why or from where.
+ * Generic over the game's discriminator `TType` and payload `TPayload`, with
+ * defaults so game-blind code can use the erased form.
  *
- * @template T
- * @typedef {{ seq: number, t: number, event: T, receivedTs?: number }} MoveEvent
+ * @template {string} [TType=string]
+ * @template [TPayload=unknown]
+ * @typedef {{ seq: number, clientTs: number, type: TType, payload: TPayload, receivedTs?: number }} MoveEvent
  */
 
 /**
- * The container: a schema-versioned, ordered array of timestamped, sequenced
- * events for one recorded run. Generic over the game's event vocabulary `T`.
- * JSON-safe as long as `T` is.
+ * The container: a schema-versioned, ordered array of recorded entries for one
+ * run. `schema_version` is the game's move-event vocabulary version, verbatim.
+ * Generic over the game (same parameters as {@link MoveEvent}); JSON-safe as long
+ * as every `payload` is.
  *
- * @template T
- * @typedef {{ schema_version: SchemaVersion, events: MoveEvent<T>[] }} MoveLog
+ * @template {string} [TType=string]
+ * @template [TPayload=unknown]
+ * @typedef {{ schema_version: string, events: MoveEvent<TType, TPayload>[] }} MoveLog
  */
 
 /**
- * Validate an events array: each entry must be a `{ seq, t, event }` with an
- * integer `seq`, a finite numeric `t`, and a present `event`; and `seq` must be
- * STRICTLY INCREASING across the array. Throws a distinct, field-specific error
- * on the first problem — never leaves a caller with a half-checked array.
+ * Assert a schema version is a non-empty string — the game's move-event
+ * vocabulary version, carried verbatim (ADR §2). Throws otherwise.
+ *
+ * @param {unknown} version
+ */
+function assertSchemaVersion(version) {
+  if (typeof version !== 'string' || version.length === 0) {
+    throw new TypeError(`move-log: schema_version must be a non-empty string (got ${JSON.stringify(version)})`)
+  }
+}
+
+/**
+ * Validate an events array: each entry must be a `{ seq, clientTs, type, payload }`
+ * object with an integer `seq`, a finite `clientTs`, a non-empty string `type`,
+ * and a PRESENT `payload` (any value — never inspected); `seq` must be STRICTLY
+ * INCREASING; a present `receivedTs` must be finite. Throws a distinct,
+ * field-specific error on the first problem — never leaves a caller with a
+ * half-checked array. Reject, never repair: nothing is mutated, truncated, or
+ * coerced. The inside of `payload` is never inspected (game-blind).
  *
  * @param {unknown} events
  */
@@ -65,14 +83,8 @@ function assertEvents(events) {
   }
   let prevSeq = -Infinity
   events.forEach((e, i) => {
-    if (e === null || typeof e !== 'object') {
-      throw new TypeError(`move-log: events[${i}] must be an object (got ${e === null ? 'null' : typeof e})`)
-    }
-    if (!('event' in e)) {
-      throw new TypeError(`move-log: events[${i}] is missing 'event'`)
-    }
-    if (typeof e.t !== 'number' || !Number.isFinite(e.t)) {
-      throw new TypeError(`move-log: events[${i}].t must be a finite number (got ${JSON.stringify(e.t)})`)
+    if (e === null || typeof e !== 'object' || Array.isArray(e)) {
+      throw new TypeError(`move-log: events[${i}] must be an object (got ${e === null ? 'null' : Array.isArray(e) ? 'array' : typeof e})`)
     }
     if (!Number.isInteger(e.seq)) {
       throw new TypeError(`move-log: events[${i}].seq must be an integer (got ${JSON.stringify(e.seq)})`)
@@ -80,6 +92,16 @@ function assertEvents(events) {
     if (e.seq <= prevSeq) {
       throw new RangeError(`move-log: events[${i}].seq must be strictly increasing (got ${e.seq} after ${prevSeq})`)
     }
+    if (typeof e.clientTs !== 'number' || !Number.isFinite(e.clientTs)) {
+      throw new TypeError(`move-log: events[${i}].clientTs must be a finite number (got ${JSON.stringify(e.clientTs)})`)
+    }
+    if (typeof e.type !== 'string' || e.type.length === 0) {
+      throw new TypeError(`move-log: events[${i}].type must be a non-empty string (got ${JSON.stringify(e.type)})`)
+    }
+    // `payload` must be PRESENT but is otherwise opaque — any value, never inspected.
+    if (!('payload' in e) || e.payload === undefined) {
+      throw new TypeError(`move-log: events[${i}].payload must be present`)
+    }
     if (e.receivedTs !== undefined && (typeof e.receivedTs !== 'number' || !Number.isFinite(e.receivedTs))) {
       throw new TypeError(`move-log: events[${i}].receivedTs must be a finite number when present (got ${JSON.stringify(e.receivedTs)})`)
     }
@@ -88,55 +110,60 @@ function assertEvents(events) {
 }
 
 /**
- * Copy one event record to the canonical field set, carrying `receivedTs`
- * through only when it's actually present (so absent stays absent — no
- * `receivedTs: undefined` keys leak into the log or its JSON).
+ * Copy one entry to the canonical field set, carrying `receivedTs` through only
+ * when it's actually present (so absent stays absent — no `receivedTs: undefined`
+ * keys leak into the log or its JSON). `payload` is copied by reference: it's the
+ * game's opaque data and the log never clones or inspects it.
  *
- * @template T
- * @param {MoveEvent<T>} e
- * @returns {MoveEvent<T>}
+ * @template {string} TType
+ * @template TPayload
+ * @param {MoveEvent<TType, TPayload>} e
+ * @returns {MoveEvent<TType, TPayload>}
  */
 function copyEvent(e) {
-  /** @type {MoveEvent<T>} */
-  const out = { seq: e.seq, t: e.t, event: e.event }
+  /** @type {MoveEvent<TType, TPayload>} */
+  const out = { seq: e.seq, clientTs: e.clientTs, type: e.type, payload: e.payload }
   if (e.receivedTs !== undefined) out.receivedTs = e.receivedTs
   return out
 }
 
 /**
- * Assert a value is a well-formed move log — correct `schema_version` and a valid
- * events array — throwing a clear, specific error otherwise. Returns the value
- * (typed) for chaining; never mutates.
+ * Assert a value is a well-formed move log — a non-empty string `schema_version`
+ * and a valid events array — throwing a clear, specific error otherwise. Returns
+ * the value (typed as the erased, game-blind form) for chaining; never mutates.
  *
  * @param {unknown} value
- * @returns {MoveLog<any>}
+ * @returns {MoveLog}
  */
 export function assertMoveLog(value) {
   if (value === null || typeof value !== 'object') {
     throw new TypeError(`move-log: expected an object (got ${value === null ? 'null' : typeof value})`)
   }
   const v = /** @type {any} */ (value)
-  if (v.schema_version !== SCHEMA_VERSION) {
-    throw new RangeError(`move-log: unsupported schema_version ${JSON.stringify(v.schema_version)} (expected ${SCHEMA_VERSION})`)
-  }
+  assertSchemaVersion(v.schema_version)
   assertEvents(v.events)
   return v
 }
 
 /**
- * Build a move log from an ordered list of `{ seq, t, event }` records. Pure and
+ * Build a move log for a game's move-event vocabulary. `schemaVersion` names that
+ * vocabulary (e.g. `"mnswpr-moves/1"`) and is stored verbatim. Pure and
  * game-agnostic: it validates only the log's own invariants (metadata types and
- * strictly increasing `seq`), never the shape of `T`. Order is preserved and
- * entries are copied, so the log never aliases the caller's array.
+ * strictly increasing `seq`), never the shape of a `payload`. Order is preserved
+ * and entries are copied, so the log never aliases the caller's array. Generic
+ * over the game — infers `TType`/`TPayload` from `events`.
  *
- * @template T
- * @param {MoveEvent<T>[]} [events] - ordered events, each `{ seq, t, event, receivedTs? }`
- * @returns {MoveLog<T>}
+ * @template {string} [TType=string]
+ * @template [TPayload=unknown]
+ * @param {string} schemaVersion - the game's move-event vocabulary version, stored verbatim
+ * @param {MoveEvent<TType, TPayload>[]} [events] - ordered entries, each `{ seq, clientTs, type, payload, receivedTs? }`
+ * @returns {MoveLog<TType, TPayload>}
  */
-export function createMoveLog(events = []) {
+export function createMoveLog(schemaVersion, events = []) {
+  assertSchemaVersion(schemaVersion)
   assertEvents(events)
   return {
-    schema_version: SCHEMA_VERSION,
+    schema_version: schemaVersion,
     events: events.map(copyEvent)
   }
 }
@@ -148,10 +175,11 @@ export function createMoveLog(events = []) {
  * consumer records WHEN it received events — the log never cares where the value
  * came from. Pure: the input log is not mutated.
  *
- * @template T
- * @param {MoveLog<T>} log
- * @param {(event: MoveEvent<T>, index: number) => number | undefined} stamp
- * @returns {MoveLog<T>}
+ * @template {string} TType
+ * @template TPayload
+ * @param {MoveLog<TType, TPayload>} log
+ * @param {(event: MoveEvent<TType, TPayload>, index: number) => number | undefined} stamp
+ * @returns {MoveLog<TType, TPayload>}
  */
 export function withReceivedTs(log, stamp) {
   assertMoveLog(log)
@@ -167,8 +195,8 @@ export function withReceivedTs(log, stamp) {
 }
 
 /**
- * Non-throwing type guard: is `value` a well-formed move log of the current
- * schema version? Checks the container invariants only — remains blind to `T`.
+ * Non-throwing type guard: is `value` a well-formed move log? Checks the
+ * container invariants only — remains blind to each `payload`.
  *
  * @param {unknown} value
  * @returns {boolean}
@@ -186,8 +214,9 @@ export function isMoveLog(value) {
  * Serialize a move log to a JSON string. Validates first, so a malformed log is
  * rejected here rather than emitted. Inverse of {@link deserializeMoveLog}.
  *
- * @template T
- * @param {MoveLog<T>} log
+ * @template {string} TType
+ * @template TPayload
+ * @param {MoveLog<TType, TPayload>} log
  * @returns {string}
  */
 export function serializeMoveLog(log) {
@@ -197,13 +226,13 @@ export function serializeMoveLog(log) {
 
 /**
  * Parse and validate a JSON string into a move log, with full fidelity: event
- * order, timestamps, and sequence numbers survive the round-trip exactly.
- * Rejects malformed input (bad JSON, missing/typed-wrong fields, non-monotonic
- * `seq`) with a clear error and NEVER returns a partially-parsed log. Inverse of
- * {@link serializeMoveLog}.
+ * order, `seq`, `clientTs`, `type`, `payload`, and any `receivedTs` survive the
+ * round-trip exactly. Rejects malformed input (bad JSON, missing/typed-wrong
+ * fields, non-monotonic `seq`) with a clear error and NEVER returns a
+ * partially-parsed log. Inverse of {@link serializeMoveLog}.
  *
  * @param {string} json
- * @returns {MoveLog<any>}
+ * @returns {MoveLog}
  */
 export function deserializeMoveLog(json) {
   if (typeof json !== 'string') {
diff --git a/packages/move-log/package.json b/packages/move-log/package.json
index fe3479f..e15ba28 100644
--- a/packages/move-log/package.json
+++ b/packages/move-log/package.json
@@ -1,9 +1,8 @@
 {
   "name": "@cozy-games/move-log",
-  "version": "0.0.1",
+  "version": "0.1.0",
   "description": "Game-blind, schema-versioned log of a recorded run of move events — generic over the game's own event vocabulary",
   "author": "Ayo Ayco",
-  "private": true,
   "type": "module",
   "repository": {
     "type": "git",
diff --git a/packages/move-log/test/move-log.test.js b/packages/move-log/test/move-log.test.js
index f81a60d..8333d36 100644
--- a/packages/move-log/test/move-log.test.js
+++ b/packages/move-log/test/move-log.test.js
@@ -8,84 +8,152 @@ import { dirname, join } from 'node:path'
 // module resolves and is importable by other packages.
 import {
   createMoveLog, withReceivedTs,
-  serializeMoveLog, deserializeMoveLog, isMoveLog, assertMoveLog, SCHEMA_VERSION
+  serializeMoveLog, deserializeMoveLog, isMoveLog, assertMoveLog
 } from '@cozy-games/move-log'
 
 // A REAL mnswpr session/event stream — imported by the TEST, never the module.
 // Relative path (not the package name) so no game dependency enters the manifest.
 import { GameSession, MinesweeperRules } from '../../mnswpr/core/index.js'
 
-/**
- * A dummy event vocabulary defined HERE, in the test — deliberately NOT mnswpr's.
- * The move log must type-check and work against any `T` the consumer supplies.
- * @typedef {{ kind: 'tick' } | { kind: 'boom', power: number }} DummyEvent
- */
+// A dummy vocabulary version string, defined HERE, in the test — deliberately not
+// tied to the module. The move log carries whatever version string the consumer
+// supplies, verbatim, and validates only its own envelope invariants.
+const VERSION = 'dummy-game/1'
 
 describe('@cozy-games/move-log', () => {
-  /** @type {import('@cozy-games/move-log').MoveEvent<DummyEvent>[]} */
+  /** @type {import('@cozy-games/move-log').MoveEvent[]} */
   const events = [
-    { seq: 1, t: 0, event: { kind: 'tick' } },
-    { seq: 2, t: 50, event: { kind: 'boom', power: 3 } },
-    { seq: 5, t: 120, event: { kind: 'tick' } } // gaps allowed; strictly increasing
+    { seq: 1, clientTs: 0, type: 'tick', payload: {} },
+    { seq: 2, clientTs: 50, type: 'boom', payload: { power: 3 } },
+    { seq: 5, clientTs: 120, type: 'tick', payload: {} } // gaps allowed; strictly increasing
   ]
 
-  it('exposes schema_version typed as 1', () => {
-    expect(SCHEMA_VERSION).toBe(1)
+  it('carries the caller-supplied schema_version string verbatim', () => {
+    const log = createMoveLog('mnswpr-moves/1', [])
+    expect(log.schema_version).toBe('mnswpr-moves/1')
+    // survives create → serialize → deserialize unchanged
+    const restored = deserializeMoveLog(serializeMoveLog(createMoveLog('mnswpr-moves/1', events)))
+    expect(restored.schema_version).toBe('mnswpr-moves/1')
   })
 
   it('wraps an ordered, timestamped, sequenced stream for a dummy vocabulary', () => {
-    /** @type {import('@cozy-games/move-log').MoveLog<DummyEvent>} */
-    const log = createMoveLog(events)
+    /** @type {import('@cozy-games/move-log').MoveLog} */
+    const log = createMoveLog(VERSION, events)
 
-    expect(log.schema_version).toBe(1)
+    expect(log.schema_version).toBe(VERSION)
     expect(log.events).toHaveLength(3)
     expect(log.events.map(e => e.seq)).toEqual([1, 2, 5])
-    expect(log.events.map(e => e.t)).toEqual([0, 50, 120])
-    expect(log.events[1]).toEqual({ seq: 2, t: 50, event: { kind: 'boom', power: 3 } })
+    expect(log.events.map(e => e.clientTs)).toEqual([0, 50, 120])
+    expect(log.events[1]).toEqual({ seq: 2, clientTs: 50, type: 'boom', payload: { power: 3 } })
   })
 
   it('defaults to an empty run and copies entries (no aliasing of the input)', () => {
-    expect(createMoveLog()).toEqual({ schema_version: 1, events: [] })
-    const input = [{ seq: 1, t: 1, event: { kind: 'tick' } }]
-    const log = createMoveLog(input)
-    input[0].t = 999
-    expect(log.events[0].t).toBe(1) // log kept its own copy
+    expect(createMoveLog(VERSION)).toEqual({ schema_version: VERSION, events: [] })
+    const input = [{ seq: 1, clientTs: 1, type: 'tick', payload: {} }]
+    const log = createMoveLog(VERSION, input)
+    input[0].clientTs = 999
+    expect(log.events[0].clientTs).toBe(1) // log kept its own copy
+  })
+
+  it('rejects a non-string / empty schema_version', () => {
+    // @ts-expect-error — deliberately wrong type
+    expect(() => createMoveLog(1, [])).toThrow(TypeError)
+    expect(() => createMoveLog('', [])).toThrow(TypeError)
+    // @ts-expect-error — deliberately missing
+    expect(() => createMoveLog(undefined, [])).toThrow(TypeError)
   })
 
   it('rejects a non-monotonic seq at construction', () => {
-    expect(() => createMoveLog([
-      { seq: 2, t: 0, event: {} },
-      { seq: 1, t: 1, event: {} }
+    expect(() => createMoveLog(VERSION, [
+      { seq: 2, clientTs: 0, type: 'a', payload: {} },
+      { seq: 1, clientTs: 1, type: 'b', payload: {} }
     ])).toThrow(RangeError)
   })
 })
 
+describe('generic over the game — a second, made-up vocabulary needs zero package changes', () => {
+  // A non-Minesweeper vocabulary defined ENTIRELY here: `TType = 'a' | 'b'`, a
+  // payload shape of `{ x: number }`. The package type-checks and validates it with
+  // no change — mirror of the consumer's "adding a game_type needs no generic change".
+  it('builds and validates MoveLog<"a" | "b", { x: number }>', () => {
+    /** @type {import('@cozy-games/move-log').MoveLog<'a' | 'b', { x: number }>} */
+    const log = createMoveLog('made-up-game/1', [
+      { seq: 1, clientTs: 0, type: 'a', payload: { x: 1 } },
+      { seq: 2, clientTs: 10, type: 'b', payload: { x: 2 } }
+    ])
+    expect(isMoveLog(log)).toBe(true)
+    expect(log.schema_version).toBe('made-up-game/1')
+    expect(log.events.map(e => e.type)).toEqual(['a', 'b'])
+    expect(log.events.map(e => e.payload.x)).toEqual([1, 2])
+    // round-trips losslessly like any other log
+    expect(deserializeMoveLog(serializeMoveLog(log))).toEqual(log)
+  })
+
+  it('Minesweeper instantiates its own discriminator + payload with the same package', () => {
+    /** @typedef {'reveal' | 'flag' | 'unflag' | 'chord'} MnswprType */
+    /** @type {import('@cozy-games/move-log').MoveLog<MnswprType, { r: number, c: number }>} */
+    const log = createMoveLog('mnswpr-moves/1', [
+      { seq: 1, clientTs: 0, type: 'reveal', payload: { r: 0, c: 0 } },
+      { seq: 2, clientTs: 5, type: 'flag', payload: { r: 1, c: 2 } }
+    ])
+    expect(log.events.map(e => e.type)).toEqual(['reveal', 'flag'])
+    expect(log.events[0].payload).toEqual({ r: 0, c: 0 })
+  })
+})
+
+describe('payload is opaque — any present value is accepted, never inspected', () => {
+  it('accepts object, array, primitive, and null payloads', () => {
+    const log = createMoveLog(VERSION, [
+      { seq: 1, clientTs: 0, type: 'obj', payload: { a: 1 } },
+      { seq: 2, clientTs: 1, type: 'arr', payload: [1, 2, 3] },
+      { seq: 3, clientTs: 2, type: 'str', payload: 'hello' },
+      { seq: 4, clientTs: 3, type: 'num', payload: 42 },
+      { seq: 5, clientTs: 4, type: 'nul', payload: null }
+    ])
+    expect(isMoveLog(log)).toBe(true)
+    expect(deserializeMoveLog(serializeMoveLog(log))).toEqual(log)
+  })
+
+  it('rejects a MISSING payload (the only payload invariant)', () => {
+    expect(() => createMoveLog(VERSION, [
+      // @ts-expect-error — deliberately missing payload
+      { seq: 1, clientTs: 0, type: 'x' }
+    ])).toThrow(TypeError)
+    expect(() => deserializeMoveLog(JSON.stringify({
+      schema_version: VERSION, events: [{ seq: 1, clientTs: 0, type: 'x' }]
+    }))).toThrow(TypeError)
+  })
+})
+
 describe('serialization round-trip', () => {
   const events = [
-    { seq: 1, t: 0, event: { type: 'reveal', r: 0, c: 0 } },
-    { seq: 2, t: 50, event: { type: 'flag', r: 1, c: 2 } },
-    { seq: 3, t: 90, event: { type: 'chord', r: 4, c: 4 } }
+    { seq: 1, clientTs: 0, type: 'reveal', payload: { r: 0, c: 0 } },
+    { seq: 2, clientTs: 50, type: 'flag', payload: { r: 1, c: 2 } },
+    { seq: 3, clientTs: 90, type: 'chord', payload: { r: 4, c: 4 } }
   ]
 
-  it('preserves order, timestamps, and sequence numbers exactly', () => {
-    const log = createMoveLog(events)
+  it('preserves order, timestamps, types, payloads, and sequence numbers exactly', () => {
+    const log = createMoveLog(VERSION, events)
     const restored = deserializeMoveLog(serializeMoveLog(log))
 
     expect(restored).toEqual(log) // full structural fidelity
+    expect(restored.schema_version).toBe(VERSION)
     expect(restored.events.map(e => e.seq)).toEqual([1, 2, 3])
-    expect(restored.events.map(e => e.t)).toEqual([0, 50, 90])
-    expect(restored.events.map(e => e.event.type)).toEqual(['reveal', 'flag', 'chord'])
+    expect(restored.events.map(e => e.clientTs)).toEqual([0, 50, 90])
+    expect(restored.events.map(e => e.type)).toEqual(['reveal', 'flag', 'chord'])
+    expect(restored.events.map(e => e.payload)).toEqual([{ r: 0, c: 0 }, { r: 1, c: 2 }, { r: 4, c: 4 }])
   })
 
   it('serializeMoveLog produces a JSON string parseable back to the same object', () => {
-    const log = createMoveLog(events)
+    const log = createMoveLog(VERSION, events)
     const json = serializeMoveLog(log)
     expect(typeof json).toBe('string')
     expect(JSON.parse(json)).toEqual(log)
   })
 
   it('rejects each malformed fixture with a distinct, clear error', () => {
-    const valid = serializeMoveLog(createMoveLog(events))
+    const valid = serializeMoveLog(createMoveLog(VERSION, events))
+    const entry = { seq: 1, clientTs: 0, type: 'reveal', payload: {} }
 
     // not a string
     // @ts-expect-error — deliberately wrong type
@@ -93,21 +161,26 @@ describe('serialization round-trip', () => {
     // invalid JSON syntax
     expect(() => deserializeMoveLog('{not json')).toThrow(SyntaxError)
     // missing schema_version
-    expect(() => deserializeMoveLog(JSON.stringify({ events: [] }))).toThrow(RangeError)
-    // wrong schema_version
-    expect(() => deserializeMoveLog(JSON.stringify({ schema_version: 2, events: [] }))).toThrow(RangeError)
+    expect(() => deserializeMoveLog(JSON.stringify({ events: [] }))).toThrow(TypeError)
+    // non-string schema_version
+    expect(() => deserializeMoveLog(JSON.stringify({ schema_version: 1, events: [] }))).toThrow(TypeError)
+    // empty-string schema_version
+    expect(() => deserializeMoveLog(JSON.stringify({ schema_version: '', events: [] }))).toThrow(TypeError)
     // events not an array
-    expect(() => deserializeMoveLog(JSON.stringify({ schema_version: 1, events: 'nope' }))).toThrow(TypeError)
-    // missing 'event' field
-    expect(() => deserializeMoveLog(JSON.stringify({ schema_version: 1, events: [{ seq: 1, t: 0 }] }))).toThrow(TypeError)
-    // bad timestamp type
-    expect(() => deserializeMoveLog(JSON.stringify({ schema_version: 1, events: [{ seq: 1, t: 'soon', event: {} }] }))).toThrow(TypeError)
-    // bad seq type
-    expect(() => deserializeMoveLog(JSON.stringify({ schema_version: 1, events: [{ seq: 1.5, t: 0, event: {} }] }))).toThrow(TypeError)
+    expect(() => deserializeMoveLog(JSON.stringify({ schema_version: VERSION, events: 'nope' }))).toThrow(TypeError)
+    // non-integer seq
+    expect(() => deserializeMoveLog(JSON.stringify({ schema_version: VERSION, events: [{ ...entry, seq: 1.5 }] }))).toThrow(TypeError)
+    // non-finite clientTs
+    expect(() => deserializeMoveLog(JSON.stringify({ schema_version: VERSION, events: [{ ...entry, clientTs: 'soon' }] }))).toThrow(TypeError)
+    // empty / non-string type
+    expect(() => deserializeMoveLog(JSON.stringify({ schema_version: VERSION, events: [{ ...entry, type: '' }] }))).toThrow(TypeError)
+    expect(() => deserializeMoveLog(JSON.stringify({ schema_version: VERSION, events: [{ ...entry, type: 7 }] }))).toThrow(TypeError)
+    // missing payload
+    expect(() => deserializeMoveLog(JSON.stringify({ schema_version: VERSION, events: [{ seq: 1, clientTs: 0, type: 'reveal' }] }))).toThrow(TypeError)
     // shuffled / non-monotonic seq
     const shuffled = JSON.stringify({
-      schema_version: 1,
-      events: [{ seq: 3, t: 0, event: {} }, { seq: 1, t: 1, event: {} }]
+      schema_version: VERSION,
+      events: [{ seq: 3, clientTs: 0, type: 'a', payload: {} }, { seq: 1, clientTs: 1, type: 'b', payload: {} }]
     })
     expect(() => deserializeMoveLog(shuffled)).toThrow(RangeError)
 
@@ -115,7 +188,8 @@ describe('serialization round-trip', () => {
     const messages = [
       captureMessage(() => deserializeMoveLog('{not json')),
       captureMessage(() => deserializeMoveLog(JSON.stringify({ events: [] }))),
-      captureMessage(() => deserializeMoveLog(JSON.stringify({ schema_version: 1, events: [{ seq: 1, t: 0 }] }))),
+      captureMessage(() => deserializeMoveLog(JSON.stringify({ schema_version: VERSION, events: [{ ...entry, type: '' }] }))),
+      captureMessage(() => deserializeMoveLog(JSON.stringify({ schema_version: VERSION, events: [{ seq: 1, clientTs: 0, type: 'reveal' }] }))),
       captureMessage(() => deserializeMoveLog(shuffled))
     ]
     expect(new Set(messages).size).toBe(messages.length)
@@ -126,8 +200,8 @@ describe('serialization round-trip', () => {
 
   it('never returns a partially-parsed log (throws before returning)', () => {
     const partlyBad = JSON.stringify({
-      schema_version: 1,
-      events: [{ seq: 1, t: 0, event: { ok: true } }, { seq: 2, t: 'bad', event: {} }]
+      schema_version: VERSION,
+      events: [{ seq: 1, clientTs: 0, type: 'ok', payload: { ok: true } }, { seq: 2, clientTs: 'bad', type: 'x', payload: {} }]
     })
     let result = 'sentinel'
     expect(() => { result = deserializeMoveLog(partlyBad) }).toThrow(TypeError)
@@ -135,24 +209,24 @@ describe('serialization round-trip', () => {
   })
 
   it('isMoveLog / assertMoveLog agree on validity', () => {
-    const log = createMoveLog(events)
+    const log = createMoveLog(VERSION, events)
     expect(isMoveLog(log)).toBe(true)
     expect(assertMoveLog(log)).toBe(log)
     expect(isMoveLog(null)).toBe(false)
-    expect(isMoveLog({ schema_version: 1, events: [{ seq: 1, t: 0 }] })).toBe(false)
+    expect(isMoveLog({ schema_version: VERSION, events: [{ seq: 1, clientTs: 0, type: 'x' }] })).toBe(false)
   })
 })
 
 describe('received timestamps (additive receivedTs)', () => {
   const base = [
-    { seq: 1, t: 0, event: { type: 'reveal', r: 0, c: 0 } },
-    { seq: 2, t: 50, event: { type: 'flag', r: 1, c: 2 } }
+    { seq: 1, clientTs: 0, type: 'reveal', payload: { r: 0, c: 0 } },
+    { seq: 2, clientTs: 50, type: 'flag', payload: { r: 1, c: 2 } }
   ]
 
   it('accepts an optional receivedTs per event and round-trips it', () => {
-    const log = createMoveLog([
-      { seq: 1, t: 0, event: { k: 'a' }, receivedTs: 1000 },
-      { seq: 2, t: 50, event: { k: 'b' }, receivedTs: 1060 }
+    const log = createMoveLog(VERSION, [
+      { seq: 1, clientTs: 0, type: 'a', payload: {}, receivedTs: 1000 },
+      { seq: 2, clientTs: 50, type: 'b', payload: {}, receivedTs: 1060 }
     ])
     expect(log.events[0].receivedTs).toBe(1000)
     const restored = deserializeMoveLog(serializeMoveLog(log))
@@ -161,9 +235,9 @@ describe('received timestamps (additive receivedTs)', () => {
   })
 
   it('is valid with receivedTs on only some events', () => {
-    const log = createMoveLog([
-      { seq: 1, t: 0, event: { k: 'a' }, receivedTs: 1000 },
-      { seq: 2, t: 50, event: { k: 'b' } } // no receivedTs
+    const log = createMoveLog(VERSION, [
+      { seq: 1, clientTs: 0, type: 'a', payload: {}, receivedTs: 1000 },
+      { seq: 2, clientTs: 50, type: 'b', payload: {} } // no receivedTs
     ])
     expect(isMoveLog(log)).toBe(true)
     expect('receivedTs' in log.events[1]).toBe(false)
@@ -171,7 +245,7 @@ describe('received timestamps (additive receivedTs)', () => {
   })
 
   it('REGRESSION: a log with no receivedTs anywhere stays fully valid and leaks no key', () => {
-    const log = createMoveLog(base)
+    const log = createMoveLog(VERSION, base)
     expect(isMoveLog(log)).toBe(true)
     expect(log.events.every(e => !('receivedTs' in e))).toBe(true)
     const restored = deserializeMoveLog(serializeMoveLog(log))
@@ -180,29 +254,29 @@ describe('received timestamps (additive receivedTs)', () => {
   })
 
   it('rejects a non-finite / non-numeric receivedTs', () => {
-    expect(() => createMoveLog([{ seq: 1, t: 0, event: {}, receivedTs: 'soon' }])).toThrow(TypeError)
-    expect(() => createMoveLog([{ seq: 1, t: 0, event: {}, receivedTs: Infinity }])).toThrow(TypeError)
+    expect(() => createMoveLog(VERSION, [{ seq: 1, clientTs: 0, type: 'x', payload: {}, receivedTs: 'soon' }])).toThrow(TypeError)
+    expect(() => createMoveLog(VERSION, [{ seq: 1, clientTs: 0, type: 'x', payload: {}, receivedTs: Infinity }])).toThrow(TypeError)
     expect(() => deserializeMoveLog(JSON.stringify({
-      schema_version: 1,
-      events: [{ seq: 1, t: 0, event: {}, receivedTs: 'later' }]
+      schema_version: VERSION,
+      events: [{ seq: 1, clientTs: 0, type: 'x', payload: {}, receivedTs: 'later' }]
     }))).toThrow(TypeError)
   })
 
   it('withReceivedTs attaches host-received times additively without mutating the input', () => {
-    const log = createMoveLog(base)
+    const log = createMoveLog(VERSION, base)
     let clock = 900
     const stamped = withReceivedTs(log, () => (clock += 10))
 
     // input untouched
     expect(log.events.every(e => !('receivedTs' in e))).toBe(true)
-    // output stamped, still a valid v1 log, round-trips
+    // output stamped, still a valid log, round-trips
     expect(stamped.events.map(e => e.receivedTs)).toEqual([910, 920])
-    expect(stamped.schema_version).toBe(1)
+    expect(stamped.schema_version).toBe(VERSION)
     expect(deserializeMoveLog(serializeMoveLog(stamped))).toEqual(stamped)
   })
 
   it('withReceivedTs leaves events unstamped when the stamp returns undefined', () => {
-    const log = createMoveLog(base)
+    const log = createMoveLog(VERSION, base)
     const stamped = withReceivedTs(log, (e) => (e.seq === 1 ? 1234 : undefined))
     expect(stamped.events[0].receivedTs).toBe(1234)
     expect('receivedTs' in stamped.events[1]).toBe(false)
@@ -210,20 +284,9 @@ describe('received timestamps (additive receivedTs)', () => {
   })
 
   it('withReceivedTs rejects a stamp that returns a non-finite number', () => {
-    const log = createMoveLog(base)
+    const log = createMoveLog(VERSION, base)
     expect(() => withReceivedTs(log, () => NaN)).toThrow(TypeError)
   })
-
-  it('VERSIONING: receivedTs is additive — same schema_version with or without it', () => {
-    const without = createMoveLog(base)
-    const withRt = withReceivedTs(without, () => 1000)
-    expect(without.schema_version).toBe(SCHEMA_VERSION)
-    expect(withRt.schema_version).toBe(SCHEMA_VERSION)
-    expect(SCHEMA_VERSION).toBe(1)
-    // a v1 reader accepts both shapes
-    expect(isMoveLog(without)).toBe(true)
-    expect(isMoveLog(withRt)).toBe(true)
-  })
 })
 
 describe('integration: wraps a real mnswpr event stream (core-06)', () => {
@@ -258,14 +321,19 @@ describe('integration: wraps a real mnswpr event stream (core-06)', () => {
 
     expect(emitted.map(e => e.type)).toEqual(['reveal', 'flag', 'unflag', 'flag', 'chord'])
 
-    // Wrap the stream: lift the recording metadata (seq, t) to the log level.
-    const log = createMoveLog(emitted.map(e => ({ seq: e.seq, t: e.t, event: e })))
+    // Wrap the stream: the log-owned metadata (seq, clientTs) is lifted to the log
+    // level; the surfaced `type` discriminator + opaque game `payload` (the move
+    // coords) stay put — exactly the ADR §1 split.
+    const log = createMoveLog('mnswpr-moves/1', emitted.map(e => ({
+      seq: e.seq, clientTs: e.t, type: e.type, payload: { r: e.r, c: e.c }
+    })))
     const restored = deserializeMoveLog(serializeMoveLog(log))
 
     expect(restored).toEqual(log)
+    expect(restored.schema_version).toBe('mnswpr-moves/1')
     expect(restored.events.map(e => e.seq)).toEqual([1, 2, 3, 4, 5])
-    expect(restored.events.map(e => e.t)).toEqual([1050, 1100, 1150, 1200, 1250])
-    expect(restored.events.map(e => e.event.type)).toEqual(['reveal', 'flag', 'unflag', 'flag', 'chord'])
+    expect(restored.events.map(e => e.clientTs)).toEqual([1050, 1100, 1150, 1200, 1250])
+    expect(restored.events.map(e => e.type)).toEqual(['reveal', 'flag', 'unflag', 'flag', 'chord'])
     // sequence is strictly increasing — the log's own invariant, verified on real data
     const seqs = restored.events.map(e => e.seq)
     expect(seqs).toEqual([...seqs].sort((a, b) => a - b))
diff --git a/packages/replay/index.js b/packages/replay/index.js
index a3fce9c..f08ba5f 100644
--- a/packages/replay/index.js
+++ b/packages/replay/index.js
@@ -1,14 +1,14 @@
 // @ts-check
-import { assertMoveLog, SCHEMA_VERSION } from '@cozy-games/move-log'
+import { assertMoveLog } from '@cozy-games/move-log'
 
 /**
  * `@cozy-games/replay` — the core of a game-agnostic replay engine.
  *
  * {@link PlaybackClock} re-drives a move-log envelope over time: it schedules
- * each recorded event to fire at its OFFSET (its `t` relative to the first
+ * each recorded event to fire at its OFFSET (its `clientTs` relative to the first
  * event) as playback time advances, and supports play / pause / seek. It
  * consumes ONLY the generic envelope (`@cozy-games/move-log`) and never inspects
- * the inside of an `event` — no game types cross this boundary.
+ * the inside of a `payload` — no game types cross this boundary.
  *
  * The clock and scheduler are injected (mirroring the core session's
  * injected-clock seam), so tests drive it with fake timers or a hand-rolled
@@ -16,8 +16,8 @@ import { assertMoveLog, SCHEMA_VERSION } from '@cozy-games/move-log'
  */
 
 /**
- * @typedef {import('@cozy-games/move-log').MoveEvent<any>} Event
- * @typedef {import('@cozy-games/move-log').MoveLog<any>} Envelope
+ * @typedef {import('@cozy-games/move-log').MoveEvent} Event
+ * @typedef {import('@cozy-games/move-log').MoveLog} Envelope
  * @typedef {{
  *   clock?: () => number,
  *   setTimeout?: (fn: () => void, ms: number) => any,
@@ -28,22 +28,20 @@ import { assertMoveLog, SCHEMA_VERSION } from '@cozy-games/move-log'
 /**
  * A reducer supplied by a game adapter: given the ordered slice of events played
  * so far (offset <= the current position), return a completion percentage in
- * `[0, 100]`. Typed generically over the game's event vocabulary `T`. The engine
- * clamps the result and never inspects an event's payload — all interpretation
- * lives in this reducer.
+ * `[0, 100]`. The engine clamps the result and never inspects an event's payload —
+ * all interpretation lives in this reducer.
  *
- * @template T
- * @typedef {(events: import('@cozy-games/move-log').MoveEvent<T>[]) => number} ProgressReducer
+ * @typedef {(events: Event[]) => number} ProgressReducer
  */
 
 /**
  * A reducer supplied by a game adapter for full-board replay: given the ordered
  * slice of events played so far, reconstruct the complete game state `S` at that
- * point. Typed generically over the event vocabulary `T` and the (opaque) state
- * `S`. Powers the flag-gated full-board mode; the engine treats `S` as a black box.
+ * point. Typed generically over the (opaque) state `S`. Powers the flag-gated
+ * full-board mode; the engine treats `S` as a black box.
  *
- * @template T, S
- * @typedef {(events: import('@cozy-games/move-log').MoveEvent<T>[]) => S} StateReducer
+ * @template S
+ * @typedef {(events: Event[]) => S} StateReducer
  */
 
 /**
@@ -51,41 +49,40 @@ import { assertMoveLog, SCHEMA_VERSION } from '@cozy-games/move-log'
  * enters the engine. Both methods are optional; the engine calls whichever the
  * mode needs and never interprets an event itself. See `docs/adapter-interface.md`.
  *
- * @template T
- * @typedef {{ progress?: ProgressReducer<T>, state?: StateReducer<T, any> }} ReplayAdapter
+ * @typedef {{ progress?: ProgressReducer, state?: StateReducer<any> }} ReplayAdapter
  */
 
 /**
- * A version reader: normalize a raw envelope of its generation into the canonical
- * ordered `MoveEvent` records the engine plays. One engine build can therefore
- * replay envelopes from multiple format generations.
+ * A version reader: normalize a raw envelope of a FOREIGN/legacy generation into
+ * the canonical ordered move-log records the engine plays. One engine build can
+ * therefore replay envelopes from multiple format generations. A canonical
+ * `@cozy-games/move-log` envelope needs no reader — it plays directly.
  *
  * @typedef {(envelope: any) => Event[]} EnvelopeReader
  */
 
-/** v1 is the canonical format itself — its `events` are already the records. */
-function readV1(envelope) {
-  return envelope.events
-}
-
 /**
- * The built-in dispatch table: `schema_version → reader`. Adding a real future
- * generation is exactly one entry here (plus its normalizer). Callers can also
- * supply extra/override readers per instance via the `readers` option.
+ * Built-in readers, keyed by `schema_version` string. Empty by default: a
+ * canonical move-log envelope IS the record set. This exists only as the base a
+ * caller's per-instance `readers` merge onto, to normalize foreign generations.
  *
- * @type {Record<number, EnvelopeReader>}
+ * @type {Record<string, EnvelopeReader>}
  */
-const ENVELOPE_READERS = { [SCHEMA_VERSION]: readV1 }
+const ENVELOPE_READERS = {}
 
 /**
- * Dispatch on an envelope's `schema_version` to the matching reader and return
- * the canonical `MoveEvent` records. Unknown/unsupported versions fail LOUDLY
- * with a specific error — never a silent best-effort parse. Whatever a reader
- * returns is validated as a canonical move log, so a half-normalized generation
- * can't reach the engine.
+ * Resolve an envelope to the canonical ordered move-log records the engine plays.
+ *
+ * A canonical `@cozy-games/move-log` envelope plays directly: it is validated in
+ * full (via {@link assertMoveLog}) and its `events` are the records. A caller may
+ * also register per-version `readers` to normalize a FOREIGN generation back to
+ * canonical records, keyed by that generation's `schema_version` string — when
+ * one matches it wins, and whatever it returns is validated so a half-normalized
+ * log can't reach the engine. Either way, malformed input fails LOUDLY with a
+ * field-specific error — never a silent best-effort parse.
  *
  * @param {any} envelope
- * @param {Record<number, EnvelopeReader>} [extraReaders] - added/overriding readers
+ * @param {Record<string, EnvelopeReader>} [extraReaders] - added/overriding readers, keyed by schema_version
  * @returns {Event[]}
  */
 export function readEnvelope(envelope, extraReaders) {
@@ -93,25 +90,25 @@ export function readEnvelope(envelope, extraReaders) {
     throw new TypeError(`readEnvelope: expected an envelope object (got ${envelope === null ? 'null' : typeof envelope})`)
   }
   const readers = extraReaders ? { ...ENVELOPE_READERS, ...extraReaders } : ENVELOPE_READERS
-  const version = envelope.schema_version
-  const read = readers[version]
-  if (typeof read !== 'function') {
-    const supported = Object.keys(readers).map(Number).sort((a, b) => a - b).join(', ')
-    throw new RangeError(`readEnvelope: unsupported envelope schema_version ${JSON.stringify(version)} (supported: ${supported})`)
+  const version = /** @type {any} */ (envelope).schema_version
+  const read = typeof version === 'string' ? readers[version] : undefined
+  if (read) {
+    const records = read(envelope)
+    // A foreign reader MUST normalize to canonical records; validate them under
+    // the source version so a half-normalized generation can't reach the engine.
+    assertMoveLog({ schema_version: version, events: records })
+    return records
   }
-  const records = read(envelope)
-  // Every reader MUST normalize to canonical move-log records; enforce it here so
-  // no downstream generation can feed the engine a malformed or half-normalized log.
-  assertMoveLog({ schema_version: SCHEMA_VERSION, events: records })
-  return records
+  // Default: the envelope itself must be a well-formed canonical move log.
+  return assertMoveLog(envelope).events
 }
 
 export class PlaybackClock {
   /**
    * @param {Envelope} envelope - a valid move-log envelope (validated here)
    * @param {Deps} [deps] - injected time source + scheduler (default: real host)
-   * @param {ReplayAdapter<any>} [adapter] - game adapter (progress / state reducers)
-   * @param {{ fullBoard?: boolean, readers?: Record<number, EnvelopeReader> }} [options] -
+   * @param {ReplayAdapter} [adapter] - game adapter (progress / state reducers)
+   * @param {{ fullBoard?: boolean, readers?: Record<string, EnvelopeReader> }} [options] -
    *   `fullBoard` flag-gates full-board mode (default OFF: `state()`/`onState` are
    *   inert and the state reducer is never called) — the minimal, documented
    *   feature-flag seam for this engine. `readers` adds/overrides schema-version
@@ -140,10 +137,10 @@ export class PlaybackClock {
 
     // Sort by recorded time (tie-break by seq) and rebase to offsets so the first
     // event sits at offset 0 — "recorded offset relative to playback time".
-    const sorted = [...records].sort((a, b) => a.t - b.t || a.seq - b.seq)
-    const baseT = sorted.length ? sorted[0].t : 0
+    const sorted = [...records].sort((a, b) => a.clientTs - b.clientTs || a.seq - b.seq)
+    const baseT = sorted.length ? sorted[0].clientTs : 0
     /** @type {{ offset: number, record: Event }[]} */
-    this._events = sorted.map(record => ({ offset: record.t - baseT, record }))
+    this._events = sorted.map(record => ({ offset: record.clientTs - baseT, record }))
     this._duration = this._events.length ? this._events[this._events.length - 1].offset : 0
 
     // Playback state. Invariant: `_cursor` === number of events whose offset is
@@ -222,7 +219,8 @@ export class PlaybackClock {
 
   /**
    * Subscribe to delivered events. The handler receives the raw envelope record
-   * (`{ seq, t, event, ... }`) — the payload stays opaque. Returns an unsubscribe.
+   * (`{ seq, clientTs, type, payload, ... }`) — the payload stays opaque. Returns
+   * an unsubscribe.
    *
    * @param {(event: Event) => void} handler
    * @returns {() => void}
diff --git a/packages/replay/test/full-board-mode.test.js b/packages/replay/test/full-board-mode.test.js
index 2e7c9cb..914255b 100644
--- a/packages/replay/test/full-board-mode.test.js
+++ b/packages/replay/test/full-board-mode.test.js
@@ -3,6 +3,8 @@ import { describe, it, expect } from 'vitest'
 import { PlaybackClock } from '@cozy-games/replay'
 import { createMoveLog } from '@cozy-games/move-log'
 
+const VERSION = 'mnswpr-moves/1'
+
 // Real mnswpr run + state reducer — imported by the TEST (relative), so no game
 // dependency enters the engine's manifest.
 import { GameSession, MinesweeperRules } from '../../mnswpr/core/index.js'
@@ -64,12 +66,12 @@ for (const step of [
   nowClock = step.at
   session.applyMove(step.move)
 }
-const records = emitted.map(e => ({ seq: e.seq, t: e.t, event: e }))
-const envelope = createMoveLog(records)
+const records = emitted.map(e => ({ seq: e.seq, clientTs: e.t, type: e.type, payload: { r: e.r, c: e.c } }))
+const envelope = createMoveLog(VERSION, records)
 const reduce = createStateReducer(board)
 
 // Independent ground truth: reduce over records at offset <= t.
-const truth = t => reduce(records.filter(r => (r.t - baseT) <= t))
+const truth = t => reduce(records.filter(r => (r.clientTs - baseT) <= t))
 
 describe('full-board mode — flag gating (inert by default)', () => {
   it('does nothing when the flag is off, even with a state reducer', () => {
diff --git a/packages/replay/test/partial-logs.test.js b/packages/replay/test/partial-logs.test.js
index 193a9ab..b567052 100644
--- a/packages/replay/test/partial-logs.test.js
+++ b/packages/replay/test/partial-logs.test.js
@@ -3,6 +3,8 @@ import { describe, it, expect } from 'vitest'
 import { PlaybackClock } from '@cozy-games/replay'
 import { createMoveLog } from '@cozy-games/move-log'
 
+const VERSION = 'mnswpr-moves/1'
+
 // Real mnswpr run + reducers — imported by the TEST (relative), so no game
 // dependency enters the engine's manifest.
 import { GameSession, MinesweeperRules } from '../../mnswpr/core/index.js'
@@ -62,7 +64,7 @@ function truncatedEnvelope() {
   // ...stream cut here — no terminal event.
   const baseT = 1000
   return {
-    envelope: createMoveLog(emitted.map(e => ({ seq: e.seq, t: e.t, event: e }))),
+    envelope: createMoveLog(VERSION, emitted.map(e => ({ seq: e.seq, clientTs: e.t, type: e.type, payload: { r: e.r, c: e.c } }))),
     lastOffset: 1200 - baseT // 200
   }
 }
@@ -134,7 +136,7 @@ describe('the "ended" signal', () => {
     const emitted = []
     session.onMove(e => emitted.push(e))
     now = 1000; session.applyMove({ type: 'reveal', r: 2, c: 2 }) // floods all 8 → won
-    const complete = createMoveLog(emitted.map(e => ({ seq: e.seq, t: e.t, event: e })))
+    const complete = createMoveLog(VERSION, emitted.map(e => ({ seq: e.seq, clientTs: e.t, type: e.type, payload: { r: e.r, c: e.c } })))
 
     const s = fakeScheduler()
     const clock = new PlaybackClock(complete, s)
@@ -164,7 +166,7 @@ describe('the "ended" signal', () => {
   })
 
   it('does not fire for an empty envelope', () => {
-    const clock = new PlaybackClock(createMoveLog([]), fakeScheduler())
+    const clock = new PlaybackClock(createMoveLog(VERSION, []), fakeScheduler())
     const ends = []
     clock.onEnd(() => ends.push(1))
     clock.play()
diff --git a/packages/replay/test/playback-clock.test.js b/packages/replay/test/playback-clock.test.js
index b1f2c82..2c593a6 100644
--- a/packages/replay/test/playback-clock.test.js
+++ b/packages/replay/test/playback-clock.test.js
@@ -42,16 +42,18 @@ function fakeScheduler(start = 0) {
   }
 }
 
-// Events at offsets 0, 100, 350 (t rebased from 1000). Payload is opaque to the clock.
+const VERSION = 'dummy-game/1'
+
+// Events at offsets 0, 100, 350 (clientTs rebased from 1000). Payload is opaque to the clock.
 function envelope() {
-  return createMoveLog([
-    { seq: 1, t: 1000, event: { type: 'reveal', r: 0, c: 0 } },
-    { seq: 2, t: 1100, event: { type: 'flag', r: 1, c: 2 } },
-    { seq: 3, t: 1350, event: { type: 'chord', r: 4, c: 4 } }
+  return createMoveLog(VERSION, [
+    { seq: 1, clientTs: 1000, type: 'reveal', payload: { r: 0, c: 0 } },
+    { seq: 2, clientTs: 1100, type: 'flag', payload: { r: 1, c: 2 } },
+    { seq: 3, clientTs: 1350, type: 'chord', payload: { r: 4, c: 4 } }
   ])
 }
 
-const typesOf = records => records.map(r => r.event.type)
+const typesOf = records => records.map(r => r.type)
 
 describe('PlaybackClock — construction & shape', () => {
   it('rebases to offsets: duration is the last offset, first event at 0', () => {
@@ -67,7 +69,7 @@ describe('PlaybackClock — construction & shape', () => {
   })
 
   it('handles an empty envelope gracefully', () => {
-    const clock = new PlaybackClock(createMoveLog([]), fakeScheduler())
+    const clock = new PlaybackClock(createMoveLog(VERSION, []), fakeScheduler())
     const seen = []
     clock.on(r => seen.push(r))
     expect(clock.duration).toBe(0)
@@ -82,7 +84,7 @@ describe('PlaybackClock — play / pause with an injected scheduler', () => {
     const s = fakeScheduler()
     const clock = new PlaybackClock(envelope(), s)
     const seen = []
-    clock.on(r => seen.push({ type: r.event.type, at: s.clock() }))
+    clock.on(r => seen.push({ type: r.type, at: s.clock() }))
 
     clock.play()
     // offset-0 event fires synchronously on play
@@ -101,7 +103,7 @@ describe('PlaybackClock — play / pause with an injected scheduler', () => {
     const s = fakeScheduler()
     const clock = new PlaybackClock(envelope(), s)
     const seen = []
-    clock.on(r => seen.push(r.event.type))
+    clock.on(r => seen.push(r.type))
 
     clock.play()
     s.advance(150) // past offset 100, between 100 and 350
@@ -118,7 +120,7 @@ describe('PlaybackClock — play / pause with an injected scheduler', () => {
     const s = fakeScheduler()
     const clock = new PlaybackClock(envelope(), s)
     const seen = []
-    clock.on(r => seen.push({ type: r.event.type, at: s.clock() }))
+    clock.on(r => seen.push({ type: r.type, at: s.clock() }))
 
     clock.play()
     s.advance(150)
@@ -171,7 +173,7 @@ describe('PlaybackClock — seek determinism', () => {
     const s = fakeScheduler()
     const clock = new PlaybackClock(envelope(), s)
     const seen = []
-    clock.on(r => seen.push(r.event.type))
+    clock.on(r => seen.push(r.type))
 
     clock.play()
     s.advance(50) // only offset-0 delivered so far
@@ -205,7 +207,7 @@ describe('PlaybackClock — with vi fake timers', () => {
     // Default deps ⇒ Date.now + global setTimeout, both faked by vi.
     const clock = new PlaybackClock(envelope())
     const seen = []
-    clock.on(r => seen.push(r.event.type))
+    clock.on(r => seen.push(r.type))
 
     clock.play()
     expect(seen).toEqual(['reveal']) // offset 0 immediate
@@ -224,7 +226,7 @@ describe('PlaybackClock — progress reducer (adapter seam)', () => {
   /**
    * A dummy adapter defined HERE, in the test — the engine interprets nothing.
    * @typedef {{ type: string }} DummyEvent
-   * @type {import('@cozy-games/replay').ProgressReducer<DummyEvent>}
+   * @type {import('@cozy-games/replay').ProgressReducer}
    */
   const byCount = events => (events.length / 3) * 100 // 3 = total in envelope()
 
@@ -282,16 +284,16 @@ describe('game-agnosticism guard (envelope only, no game imports)', () => {
   const pkgDir = join(dirname(fileURLToPath(import.meta.url)), '..')
   const GAME_REFERENCES = /mnswpr|minesweeper/i
 
-  it('engine never interprets an event payload (no `.event` access in engine source)', () => {
+  it('engine never interprets a move payload (no `.payload` access in engine source)', () => {
     const offenders = []
     walk(pkgDir, file => {
       if (!file.endsWith('.js') || file.includes('/test/')) return
       const code = readFileSync(file, 'utf8')
         .replace(/\/\*[\s\S]*?\*\//g, '')
         .replace(/\/\/.*$/gm, '')
-      if (/\.event\b/.test(code)) offenders.push(file)
+      if (/\.payload\b/.test(code)) offenders.push(file)
     })
-    expect(offenders).toEqual([]) // engine references only envelope metadata (seq/t) + opaque records
+    expect(offenders).toEqual([]) // engine references only envelope metadata (seq/clientTs) + opaque records
   })
 
   it('manifest depends only on the envelope, never a game package', () => {
diff --git a/packages/replay/test/progress-mode.test.js b/packages/replay/test/progress-mode.test.js
index ffc135f..361bffa 100644
--- a/packages/replay/test/progress-mode.test.js
+++ b/packages/replay/test/progress-mode.test.js
@@ -3,6 +3,8 @@ import { describe, it, expect } from 'vitest'
 import { PlaybackClock } from '@cozy-games/replay'
 import { createMoveLog } from '@cozy-games/move-log'
 
+const VERSION = 'mnswpr-moves/1'
+
 // A real mnswpr run + its reducer — imported by the TEST via relative paths, so
 // no game dependency enters the replay engine's manifest.
 import { GameSession, MinesweeperRules } from '../../mnswpr/core/index.js'
@@ -74,8 +76,8 @@ for (const step of script) {
   truthPoints.push({ offset: step.at - baseT, revealedSafe: session.state.revealedSafe })
 }
 
-const records = emitted.map(e => ({ seq: e.seq, t: e.t, event: e }))
-const envelope = createMoveLog(records)
+const records = emitted.map(e => ({ seq: e.seq, clientTs: e.t, type: e.type, payload: { r: e.r, c: e.c } }))
+const envelope = createMoveLog(VERSION, records)
 
 // Ground truth for the mnswpr reducer: revealedSafe / total at a given offset —
 // derived from the session, NOT from the reducer under test.
@@ -90,7 +92,7 @@ function mnswprTruth(offset) {
 const totalEvents = records.length
 const dummyReduce = events => (events.length / totalEvents) * 100
 function dummyTruth(offset) {
-  return (records.filter(r => (r.t - baseT) <= offset).length / totalEvents) * 100
+  return (records.filter(r => (r.clientTs - baseT) <= offset).length / totalEvents) * 100
 }
 
 const CASES = [
@@ -99,7 +101,7 @@ const CASES = [
 ]
 
 describe.each(CASES)('progress mode — same code path, adapter: $name', ({ adapter, truth }) => {
-  const clamp = t => Math.max(0, Math.min(t, envelope.events[envelope.events.length - 1].t - baseT))
+  const clamp = t => Math.max(0, Math.min(t, envelope.events[envelope.events.length - 1].clientTs - baseT))
 
   it('progress() matches the source run at multiple points (via seek)', () => {
     const clock = new PlaybackClock(envelope, fakeScheduler(), adapter)
diff --git a/packages/replay/test/schema-dispatch.test.js b/packages/replay/test/schema-dispatch.test.js
index 9fb6228..3e2e8d5 100644
--- a/packages/replay/test/schema-dispatch.test.js
+++ b/packages/replay/test/schema-dispatch.test.js
@@ -3,6 +3,8 @@ import { describe, it, expect } from 'vitest'
 import { PlaybackClock, readEnvelope } from '@cozy-games/replay'
 import { createMoveLog } from '@cozy-games/move-log'
 
+const VERSION = 'mnswpr-moves/1'
+
 function fakeScheduler(start = 0) {
   let now = start
   let nextId = 1
@@ -32,40 +34,55 @@ function fakeScheduler(start = 0) {
   }
 }
 
-// A canonical v1 envelope.
-const v1 = () => createMoveLog([
-  { seq: 1, t: 0, event: { type: 'reveal', r: 0, c: 0 } },
-  { seq: 2, t: 100, event: { type: 'flag', r: 1, c: 1 } },
-  { seq: 3, t: 250, event: { type: 'chord', r: 2, c: 2 } }
+// A canonical `@cozy-games/move-log` envelope.
+const canonical = () => createMoveLog(VERSION, [
+  { seq: 1, clientTs: 0, type: 'reveal', payload: { r: 0, c: 0 } },
+  { seq: 2, clientTs: 100, type: 'flag', payload: { r: 1, c: 1 } },
+  { seq: 3, clientTs: 250, type: 'chord', payload: { r: 2, c: 2 } }
 ])
 
-describe('schema_version dispatch — v1 (built-in)', () => {
-  it('replays a v1 envelope through the dispatch path (not a bypass)', () => {
+describe('canonical move-log envelopes play directly', () => {
+  it('replays a canonical envelope through readEnvelope (not a bypass)', () => {
     const s = fakeScheduler()
-    const clock = new PlaybackClock(v1(), s)
+    const clock = new PlaybackClock(canonical(), s)
     const seen = []
-    clock.on(r => seen.push(r.event.type))
+    clock.on(r => seen.push(r.type))
     clock.play()
     s.advance(250)
     expect(seen).toEqual(['reveal', 'flag', 'chord'])
   })
 
-  it('readEnvelope returns the canonical records for v1', () => {
-    const records = readEnvelope(v1())
+  it('readEnvelope returns the canonical records', () => {
+    const records = readEnvelope(canonical())
     expect(records.map(r => r.seq)).toEqual([1, 2, 3])
-    expect(records[0].event.type).toBe('reveal')
+    expect(records[0].type).toBe('reveal')
+    expect(records[0].payload).toEqual({ r: 0, c: 0 })
+  })
+
+  it('is game-agnostic: any valid string schema_version plays (no allow-list)', () => {
+    // A different game's vocabulary version — the engine plays it without any
+    // per-game registration; genericness, not gatekeeping.
+    const otherGame = createMoveLog('some-other-game/3', [
+      { seq: 1, clientTs: 0, type: 'jump', payload: { x: 1 } }
+    ])
+    const records = readEnvelope(otherGame)
+    expect(records.map(r => r.type)).toEqual(['jump'])
   })
 })
 
-describe('schema_version dispatch — unknown versions fail loudly', () => {
-  it('throws a specific error for a synthetic future version (99)', () => {
-    const future = { schema_version: 99, events: [{ seq: 1, t: 0, event: {} }] }
-    expect(() => new PlaybackClock(future, fakeScheduler())).toThrow(/unsupported envelope schema_version 99 \(supported: 1\)/)
-    expect(() => readEnvelope(future)).toThrow(RangeError)
+describe('malformed envelopes fail loudly', () => {
+  it('throws for a non-string schema_version', () => {
+    const bad = { schema_version: 99, events: [{ seq: 1, clientTs: 0, type: 'x', payload: {} }] }
+    expect(() => new PlaybackClock(/** @type {any} */ (bad), fakeScheduler())).toThrow(TypeError)
+    expect(() => readEnvelope(bad)).toThrow(/schema_version must be a non-empty string/)
   })
 
   it('throws for a missing schema_version', () => {
-    expect(() => readEnvelope({ events: [] })).toThrow(/unsupported envelope schema_version undefined/)
+    expect(() => readEnvelope({ events: [] })).toThrow(/schema_version must be a non-empty string/)
+  })
+
+  it('throws for a valid version but malformed events (not a canonical log)', () => {
+    expect(() => readEnvelope({ schema_version: VERSION })).toThrow(/events must be an array/)
   })
 
   it('rejects a non-object envelope', () => {
@@ -74,43 +91,49 @@ describe('schema_version dispatch — unknown versions fail loudly', () => {
   })
 })
 
-describe('schema_version dispatch — adding a version', () => {
-  // A toy v2 format defined ENTIRELY in the test: a different field layout that a
-  // normalizer maps back to canonical { seq, t, event }. Adding it is one entry.
+describe('foreign generations normalize via a supplied reader (keyed by version string)', () => {
+  // A toy FOREIGN format defined ENTIRELY in the test: a different field layout
+  // that a normalizer maps back to canonical { seq, clientTs, type, payload }.
+  // Adding support is one reader entry, keyed by its schema_version string.
   const v2Envelope = {
-    schema_version: 2,
+    schema_version: 'toy-v2/1',
     log: [
-      { n: 1, ts: 0, payload: { type: 'reveal', r: 0, c: 0 } },
-      { n: 2, ts: 120, payload: { type: 'flag', r: 1, c: 1 } }
+      { n: 1, ts: 0, kind: 'reveal', data: { r: 0, c: 0 } },
+      { n: 2, ts: 120, kind: 'flag', data: { r: 1, c: 1 } }
     ]
   }
-  const readV2 = env => env.log.map(e => ({ seq: e.n, t: e.ts, event: e.payload }))
+  const readV2 = env => env.log.map(e => ({ seq: e.n, clientTs: e.ts, type: e.kind, payload: e.data }))
 
-  it('replays a v2 fixture via a supplied reader (same code path)', () => {
+  it('replays a foreign fixture via a supplied reader (same code path)', () => {
     const s = fakeScheduler()
-    const clock = new PlaybackClock(v2Envelope, s, {}, { readers: { 2: readV2 } })
+    const clock = new PlaybackClock(v2Envelope, s, {}, { readers: { 'toy-v2/1': readV2 } })
     const seen = []
-    clock.on(r => seen.push(r.event.type))
+    clock.on(r => seen.push(r.type))
     clock.play()
     s.advance(120)
     expect(seen).toEqual(['reveal', 'flag'])
   })
 
-  it('readEnvelope normalizes v2 to canonical records with an extra reader', () => {
-    const records = readEnvelope(v2Envelope, { 2: readV2 })
+  it('readEnvelope normalizes the foreign format to canonical records', () => {
+    const records = readEnvelope(v2Envelope, { 'toy-v2/1': readV2 })
     expect(records).toEqual([
-      { seq: 1, t: 0, event: { type: 'reveal', r: 0, c: 0 } },
-      { seq: 2, t: 120, event: { type: 'flag', r: 1, c: 1 } }
+      { seq: 1, clientTs: 0, type: 'reveal', payload: { r: 0, c: 0 } },
+      { seq: 2, clientTs: 120, type: 'flag', payload: { r: 1, c: 1 } }
     ])
   })
 
-  it('still rejects v2 when no reader is registered', () => {
-    expect(() => readEnvelope(v2Envelope)).toThrow(/unsupported envelope schema_version 2 \(supported: 1\)/)
+  it('fails loudly for the foreign format when no reader is registered', () => {
+    // Default path validates it AS a canonical log — it has no `events`, so it
+    // fails with the field-specific error, not a silent parse.
+    expect(() => readEnvelope(v2Envelope)).toThrow(/events must be an array/)
   })
 
   it('validates a reader that returns a malformed (non-canonical) log', () => {
     // A buggy reader whose output breaks the monotonic-seq invariant is caught.
-    const badReader = () => [{ seq: 2, t: 0, event: {} }, { seq: 1, t: 1, event: {} }]
-    expect(() => readEnvelope({ schema_version: 3 }, { 3: badReader })).toThrow(RangeError)
+    const badReader = () => [
+      { seq: 2, clientTs: 0, type: 'a', payload: {} },
+      { seq: 1, clientTs: 1, type: 'b', payload: {} }
+    ]
+    expect(() => readEnvelope({ schema_version: 'toy-bad/1' }, { 'toy-bad/1': badReader })).toThrow(RangeError)
   })
 })
diff --git a/packages/utils/package.json b/packages/utils/package.json
index 24439c8..af98d27 100644
--- a/packages/utils/package.json
+++ b/packages/utils/package.json
@@ -3,7 +3,6 @@
   "version": "0.0.1",
   "description": "Shared, dependency-free browser utilities for Cozy Games (storage, timer, logger, loading, date buckets)",
   "author": "Ayo Ayco",
-  "private": true,
   "type": "module",
   "repository": {
     "type": "git",