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

scripts/smoke-no-reply-api.sh

@@ -19,14 +19,14 @@ echo "[3] chat/completions"
 curl -sS -X POST "${BASE_URL}/v1/chat/completions" \
   -H 'Content-Type: application/json' \
   "${AUTH_HEADER[@]}" \
-  -d '{"model":"whispergate-no-reply-v1","messages":[{"role":"user","content":"hello"}]}' \
+  -d '{"model":"dirigent-no-reply-v1","messages":[{"role":"user","content":"hello"}]}' \
   | sed -n '1,20p'
 
 echo "[4] responses"
 curl -sS -X POST "${BASE_URL}/v1/responses" \
   -H 'Content-Type: application/json' \
   "${AUTH_HEADER[@]}" \
-  -d '{"model":"whispergate-no-reply-v1","input":"hello"}' \
+  -d '{"model":"dirigent-no-reply-v1","input":"hello"}' \
   | sed -n '1,20p'
 
 echo "smoke ok"