Table talk keeps its place in the chronicle

Live chat interleaved correctly, but a reload sank every past message
to the bottom: the rejoin sent the whole game history first and the
chat history after. Talk is now a tableTalk event in the room's event
stream at the moment it was said — the room file already preserved
the interleaving, since chat lines append between command lines — so
rejoining players read the banter between the battle lines where it
happened. The separate chatHistory message retires; unread counting
rides the event stream instead.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

packages/engine/src/game.ts

@@ -501,6 +501,7 @@ export type GameEvent =
   | { type: "moveBumped"; player: PlayerId; direction: Side }
   | { type: "attackMisdirected"; attacker: PlayerId; intended: PlayerId; rolledDirection: Side; newTarget: PlayerId | null }
   | { type: "dieRolled"; player: PlayerId | null; roll: number; purpose: string }
+  | { type: "tableTalk"; player: PlayerId; text: string }
   | { type: "retreatedInHorror"; player: PlayerId; from: Cell; to: Cell }
   | { type: "illusionWallCreated"; caster: PlayerId; edge: { cell: Cell; side: Side } }
   | { type: "illusionTested"; player: PlayerId; edge: string; result: "believes" | "seesThrough" }