feat: session auto-capture + NPC→Initiative push + lore grounding everywhere

- SessionLogger listens for a new LogEntry bus event; dice rolls,
  initiative turns/rounds, generated encounters and calendar day
  advances land in the active session as timestamped entries — the
  raw material the AI summary actually needs. Mute toggle in the
  toolbar (persisted, default on).
- NPC Generator: '⚔ to initiative' button pushes the generated stat
  block (HP) into the tracker via the existing AddCombatants bus event.
- ragQuery now set on Encounter, Quest and Session summary too
  (NPC/Item/World already had it) — every generator is world-grounded.

src/lib/bus.ts

@@ -44,6 +44,7 @@ export const bus = new EventBus();
 export const Events = {
   AddCombatants: "add-combatants",
   PlayAmbient: "play-ambient",
+  LogEntry: "log-entry",
 } as const;
 
 export type AddCombatantsPayload = {
@@ -52,6 +53,15 @@ export type AddCombatantsPayload = {
   source: string;
 };
 
+/** One auto-captured line for the active session log (dice rolls, initiative
+ *  turns, encounters, calendar days). SessionLogger owns the mute toggle. */
+export type LogEntryPayload = {
+  /** Pre-formatted line, e.g. "🎲 2d6+3 → 11 [4,5]". */
+  text: string;
+  /** One of SessionLogger's TAGS; omit for untagged. */
+  tag?: string;
+};
+
 export type PlayAmbientPayload = {
   /** Ambient sound id from the Soundboard (rain, wind, fire, …). */
   id: string;