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)

CHANGELOG.md

@@ -11,6 +11,10 @@
   - Agents cycle in their original turn-order position
   - After all mentioned agents have spoken, original order restores and state goes dormant
   - Handles edge cases: all NO_REPLY, reset, non-agent mentions
+- **Wait for human reply**: New `waitIdentifier` (default: `👤`):
+  - Agent ends with `👤` to signal it needs a human response
+  - All agents go silent (routed to no-reply model) until a human speaks
+  - Prompt injection warns agents to use sparingly (only when human is actively participating)
 - **Installer improvements**:
   - Dynamic OpenClaw dir resolution (`$OPENCLAW_DIR` → `openclaw` CLI → `~/.openclaw`)
   - Plugin installed to `$(openclaw_dir)/plugins/dirigent`