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

docs/VERIFY.md

@@ -1,4 +1,4 @@
-# WhisperGate Quick Verification
+# Dirigent Quick Verification
 
 ## 1) Start no-reply API
 
@@ -15,7 +15,7 @@ npm start
 curl -sS http://127.0.0.1:8787/health
 curl -sS -X POST http://127.0.0.1:8787/v1/chat/completions \
   -H 'Content-Type: application/json' \
-  -d '{"model":"whispergate-no-reply-v1","messages":[{"role":"user","content":"hi"}]}'
+  -d '{"model":"dirigent-no-reply-v1","messages":[{"role":"user","content":"hi"}]}'
 ```
 
 Or run bundled smoke check: