feat: complete Dirigent rename + all TASKLIST items

- Task 1: Identity prompt now includes Discord userId
- Task 2: Added configurable schedulingIdentifier (default: ➡️)
- Task 3: Moderator handoff uses <@userId>+identifier instead of semantic messages
- Task 4: All prompts/comments/help text converted to English
- Task 5: Full project rename WhisperGate → Dirigent across all files

Breaking: config key changed from plugins.entries.whispergate to plugins.entries.dirigent
Breaking: channel policies file renamed to dirigent-channel-policies.json
Breaking: tool name changed from whispergate_tools to dirigent_tools

docker-compose.yml

@@ -1,11 +1,11 @@
 services:
-  whispergate-no-reply-api:
+  dirigent-no-reply-api:
     build:
       context: ./no-reply-api
-    container_name: whispergate-no-reply-api
+    container_name: dirigent-no-reply-api
     ports:
       - "8787:8787"
     environment:
       - PORT=8787
-      - NO_REPLY_MODEL=whispergate-no-reply-v1
+      - NO_REPLY_MODEL=dirigent-no-reply-v1
     restart: unless-stopped