Stop the permanent ~7% core burn from re-fingerprinting state.db every 5s
and spinning on 0.1s stop-checks while nobody is listening. Block on
Event.wait for the poll interval, and sleep on _idle_wake until the first
subscriber arrives (maint #3035).
Co-authored-by: Cursor <cursoragent@cursor.com>
Own a private stdout descriptor before agent imports and serialize request log writes. Keep logging failures isolated from HTTP responses. Add successful chat/start subprocess delivery regressions and document header-latency semantics and cron ownership.
