feat: add 'cancelled' status for interrupted jobs in /api/jobs

[ric-yu]

Summary

• Adds a new cancelled status to the /api/jobs endpoint for jobs that were interrupted/cancelled by the user
• Previously, both failed and cancelled jobs were returned with status: 'failed', making it impossible to distinguish between them
• Now cancelled jobs return status: 'cancelled' while actual errors return status: 'failed'

Changes

• Added JobStatus.CANCELLED = 'cancelled' constant
• Updated normalize_history_item() to detect execution_interrupted messages and return cancelled status
• Updated get_all_jobs() to support filtering by cancelled status
• Added unit test for cancelled job normalization

API Usage

GET /api/jobs?status=cancelled       # Only cancelled jobs
GET /api/jobs?status=failed          # Only failed jobs (actual errors)
GET /api/jobs?status=failed,cancelled # Both

Test plan

• Unit tests pass (pytest tests/execution/test_jobs.py - 28/28 passing)
• Manual test: interrupt a running job and verify it shows status: 'cancelled'
• Manual test: trigger an error and verify it shows status: 'failed'

🤖 Generated with Claude Code

[yoland68]

Can I still comment?

[ric-yu]

Can I still comment?

Go for it, what's up?

[Kosinkadink]

I think he was testing if things work after the transfer

[ric-yu]

I think he was testing if things work after the transfer

Makes sense. Can I merge this myself? Is there another step?

[guill]

LGTM