Jason Woltje 6a80378e73 fix(fleet): heartbeat consistency — honor MOSAIC_HOME + MOSAIC_HEARTBEAT_INTERVAL ...

F3 milestone 1 — the two pre-existing HB bugs (from #584) flagged in the #590 review:
- writer (start-agent-session.sh): MOSAIC_HEARTBEAT_RUN_DIR now defaults to
  ${MOSAIC_HOME:-$HOME/.config/mosaic}/fleet/run, matching the path `fleet ps`
  reads (heartbeatPath uses the resolved mosaicHome). Fixes false "stale/unknown"
  HB on custom MOSAIC_HOME deployments.
- reader (fleet.ts): new heartbeatIntervalMs() honors MOSAIC_HEARTBEAT_INTERVAL
  (seconds); parseHeartbeat's freshness threshold now matches the writer's actual
  cadence instead of a hardcoded 15s. + vitest coverage.

Validated: custom-home writer dir == reader path; interval 30 -> 30000ms, unset
-> 15000ms; prettier clean.

Refs #542 #588

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

2026-06-21 18:16:48 -05:00

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