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)

plugin/openclaw.plugin.json

@@ -17,6 +17,7 @@
       "bypassUserIds": { "type": "array", "items": { "type": "string" }, "default": [] },
       "endSymbols": { "type": "array", "items": { "type": "string" }, "default": ["🔚"] },
       "schedulingIdentifier": { "type": "string", "default": "➡️" },
+      "waitIdentifier": { "type": "string", "default": "👤" },
       "noReplyProvider": { "type": "string" },
       "noReplyModel": { "type": "string" },
       "enableDiscordControlTool": { "type": "boolean", "default": true },