The agent's run_conversation() already triggers context compression
internally, but the WebUI was unaware of the side effects:
1. Session ID rotation: compression creates a new session_id inside
the agent. The WebUI kept writing to the old session file, causing
silent data loss. Fix: detect agent.session_id mismatch after
run_conversation(), rename the session file, and update in-memory
caches.
2. No user notification: compression was invisible. Fix: emit a
'compressed' SSE event when compression is detected. Frontend shows
a system message and toast.
3. No manual control: Fix: add /compact slash command that sends a
message to the agent requesting context compression. Shows in the
autocomplete dropdown.
Detection works two ways:
- agent.session_id != original session_id (ID rotation)
- agent.context_compressor.compression_count > 0 (compressor state)
Closes#90
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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