v0.4.1 - bug fixes. initial d12 rolls determine what player in which seat.

src/engine/apply.ts

@@ -9,8 +9,8 @@
  *   - `execute` reads state and emits events; it never mutates either.
  *   - `reduce` is the only thing that mutates, folding events into state.
  *
- * That keeps `state = fold(events)` true by construction, which is what makes replay and restart
- * recovery work. It also lets component 6 (legalActions) call these very same `check` functions,
+ * That keeps every INTENT-driven change reducible by construction. Replay and restart recovery run
+ * on the intents themselves (`protocol.md` §3), not on folding the log. It also lets component 6 (legalActions) call these very same `check` functions,
  * so the two can never drift apart — see legal.ts.
  */
 
@@ -1380,7 +1380,11 @@ function findTimetableSlot(s: GameState, from: number): number | null {
 }
 
 // ---------------------------------------------------------------------------
-// reduce — the ONLY mutator. state = fold(events).
+// reduce — the only mutator on the INTENT path.
+//
+// `applyIntent` never touches state except through here, so everything a player does is reducible.
+// The phase driver (`advance.ts`) does not: it mutates and then describes, so folding the whole log
+// does NOT reconstruct a game. `protocol.md` §3 has the consequence — the intents are canonical.
 // ---------------------------------------------------------------------------
 
 export function reduce(s: GameState, e: GameEvent): void {