Wrapper previously passed only the last user message to a fresh 'kimi -p'
per request, so both the OpenWebUI thread history and kimi's own session
state were dropped every turn.
Now each conversation is keyed by a content-hash chain over the messages
array (survives LiteLLM in between) and mapped to a persistent kimi session
resumed via 'kimi -r <id>', with the session_id captured from stream-json
meta. Each conversation also gets its own working dir under
/workspace/conversations/<id> so file state is isolated and persists across
turns. Map persisted to /workspace/.kimi-agent/sessions.json (LRU-capped);
falls back to full-transcript reseed if a mapping is missing.