- Remove 'agent' from mode dropdown; Chat/Note/OTR remain
- Add ⚡ tools toggle button in input bar (persisted in localStorage)
When on: routes to POST /orchestrate (Gemini tool loop); send btn → "Run"
When off: routes to POST /chat (direct to active role); no change
- Role selector and tools toggle are now fully independent:
active chat_role sent in orchestrate payload → used for final response
- orchestrator_engine.run() accepts response_role param; passes it to
complete(role=...) instead of hardcoded model="claude"
- OrchestrateRequest gains chat_role field (default "chat")
- Migrate stored 'agent' mode/MRU entries to 'chat' on load
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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