feat(tracking): application status states and CLI update tool

[bjridicodes]

Extend status field: new → interested → applied → interviewing → rejected/offer. Add 'python scripts/track.py {job_id} applied' to update status. Combined with feedback loop becomes a job search CRM.

[bjridicodes]

Relationships

Blocks:

• feat(ui): web UI for job browsing and status tracking #32 — web UI is built on top of status states
• feat(notifications): daily digest mode instead of per-run #35 — daily digest includes applied/interested status in the summary
• feat(output): tailored CV variants per high-score job #41 — CV tailoring is triggered by APPLY recommendation + user confirms interest
• feat(improvement): user feedback loop for scoring calibration #44 — feedback loop requires status states to know what the user acted on