Disabling gateway.heartbeat (or agents.defaults.dream) only skipped
job registration on startup; the previously persisted system job in
<workspace>/cron/jobs.json kept firing, and remove_job refuses to
touch protected system jobs. Add CronService.remove_system_job for
startup reconciliation and call it from the gateway disabled branches
so the config toggle takes effect after restart.
Two related bugs that together caused scheduled jobs to disappear after
a container restart:
1. `_save_store()` used `Path.write_text(...)`, which truncates the
destination in place. A SIGKILL or shutdown mid-write left
`jobs.json` either truncated or corrupt.
2. `_load_jobs()` caught any parse error, logged at WARNING, and
returned an empty list. `start()` then called `_save_store()`
immediately, overwriting the corrupt-but-recoverable file with an
empty job array. Every scheduled job was silently lost with only a
single warning line in the log.
Reproduction in production: container restart at 18:08, after which a
job that had fired correctly for two consecutive days never fired
again. jobs.json on disk was missing the job entirely.
Fix:
- `_save_store()` now writes via temp file + `os.replace` + `fsync`
(matches the session manager pattern from 512bf59,
"fix(session): fsync sessions on graceful shutdown to prevent data
loss"). An interrupted write cannot corrupt the live file.
- `_load_jobs()` now moves a corrupt store aside as
`jobs.json.corrupt-<ts>` and returns `None` instead of `[]`.
- `start()` aborts with a `RuntimeError` when the on-disk store is
corrupt, instead of starting empty and overwriting.
- `_load_store()` falls back to the previous in-memory snapshot when
a hot reload encounters a corrupt file, so a transient corruption
after start does not drop live jobs.
Tests cover the atomic-write path, the corrupt-file preservation,
the start-time refusal, the in-memory fallback, and a basic save/load
round trip across two service instances. Existing 79 cron tests and
full suite (2553 tests) still pass.
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