feat: wait for human reply (waitIdentifier 👤)

- Add waitIdentifier config (default: 👤) to DirigentConfig and plugin schema
- Prompt injection: tells agents to end with 👤 when they need a human reply,
  warns to use sparingly (only when human is actively participating)
- Detection in before_message_write and message_sent hooks
- Turn manager: new waitingForHuman state
  - checkTurn() blocks all agents when waiting
  - onNewMessage() clears state on human message
  - Non-human messages ignored while waiting
  - resetTurn() also clears waiting state
- All agents routed to no-reply model during waiting state
- Update docs (FEAT.md, CHANGELOG.md, TASKLIST.md, README.md)

TASKLIST.md

@@ -69,6 +69,17 @@
 - New helpers in `index.ts`: `buildUserIdToAccountIdMap()`, `extractMentionedUserIds()`.
 - **Done**: Override logic integrated in `message_received` handler.
 
+## 8) Wait for Human Reply ✅
+- Added configurable `waitIdentifier` (default: `👤`) to config and config schema.
+- Prompt injection in group chats: tells agents to end with `👤` instead of end symbol when they need a human response. Warns to use sparingly — only when human is actively participating.
+- Detection in `before_message_write` and `message_sent`: if last char matches wait identifier → `setWaitingForHuman(channelId)`.
+- Turn manager `waitingForHuman` state:
+  - `checkTurn()` blocks all agents (`reason: "waiting_for_human"`) → routed to no-reply model.
+  - `onNewMessage()` clears `waitingForHuman` on human message → normal flow resumes.
+  - Non-human messages ignored while waiting.
+  - `resetTurn()` also clears waiting state.
+- **Done**: Full lifecycle implemented across turn-manager, rules, and index.
+
 ---
 
 ## Open Items / Notes