- Rewrite codex-runner to use `codex app-server` JSON-RPC instead of
`codex exec`. Supports streaming (item/agentMessage/delta), session
persistence (thread/start, thread/resume), and mid-turn message
injection (turn/steer with IPC polling during execution).
- Fix token refresh not syncing to per-group session directories,
causing 401 errors on running agents.
- Fix typing indicator staying on when codex returns null result
by always clearing typing on any streaming callback.
- Update README and CLAUDE.md to reflect dual-service architecture,
host process mode, and codex app-server integration.
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