Replaces the hard-coded HEARTBEAT_INTERVAL=30 in heartbeat.py and
log_level="info" in main.py with values from
ObservabilityConfig (#119 PR-1, schema landed in PR #2538).
Concrete plumbing:
- heartbeat.HeartbeatLoop accepts an `interval_seconds=` keyword
arg. Defaults to the legacy module constant so 2-arg callers
(existing tests, any downstream code that hasn't been updated)
keep their existing 30s behavior.
- main.py constructs HeartbeatLoop with
config.observability.heartbeat_interval_seconds — the value the
config parser already clamped to [5, 300].
- main.py's uvicorn.Config takes log_level from
config.observability.log_level (lowercased — uvicorn's convention
differs from Python logging's) with LOG_LEVEL env still winning
as an ops-side debugging override.
Adapter EventLog wiring deferred to PR-3b (#208 follow-up) — touches
adapter_base interface + needs careful design, kept separate to keep
this PR small + reviewable.
Tests:
- test_heartbeat.py: 3 new tests pin default interval, explicit
override, and the [5, 300] band that the constructor accepts
without re-clamping (clamping is the parser's job).
- All 88 tests in test_heartbeat.py + test_config.py pass.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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