test(core): add comprehensive unit tests for JobManager and helpers (#2440)
* test(core): add comprehensive unit tests for JobManager and helpers
Add 35 unit tests covering:
- JobManager lifecycle (enqueue, set_running, update_progress, complete, fail, cancel, pause, resume)
- Exponential backoff computation and saturation
- History truncation beyond MAX_JOB_HISTORY_ENTRIES
- Persisted detail encode/parse round-trip
- Job status string conversion round-trips
- Helper functions (truncate_preview, json_optional_string, parse_retry_metadata, parse_history_entry)
- Status mapping between runtime and persisted types
- Initial history preview generation
* style: fix cargo fmt formatting
* test(core): fix job manager test hygiene
---------
Co-authored-by: Hu Qiantao <huqiantao@HudeMacBook-Air.local>
Co-authored-by: Hunter B <hmbown@gmail.com>
HUQIANTAO
9c336123ea