fix: expose active run lifecycle in health - #2039
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Summary
STREAMS.active_runs, per-run metadata/age,oldest_run_age_seconds,last_run_finished_at, and idle grace timing in/health.Why
active_streamsonly describes SSE channel state. A worker can outlive its SSE stream while unwinding, blocked in a provider call, handling cancellation, or waiting on delegated work. Restart/update guards need visibility into worker lifecycle too, otherwise/healthcan look idle while the engine room is still making unpleasant noises.Test Plan
python -m pytest tests/test_run_lifecycle_health.py -q -o 'addopts='python -m py_compile api/config.py api/routes.py api/streaming.pygit diff --checkReview note
A delegated reviewer attempt failed before tool execution with provider-side HTTP 429. I did not count it as approval; this PR has targeted regression tests plus static/security checks.