[Abhishek Jha (SpinachDigital)]

Fixes the shutdown path for active scenario runs (Closes #3746).
Root cause: shutdown_async sets the active run's cancellation intent to FAILED/ScenarioInterruptedError and then cancels its task, but Scenario.run_async persists CANCELLED when the cancellation propagates through it. The service handler's gated compare-and-swap write (CREATED/IN_PROGRESS only) then no-ops on the already-terminal row, so the run stays CANCELLED and loses saved-config resume eligibility. Queued runs were already correct, which matches the issue.
Fix: keep the gated write first (user-cancel path unchanged); when it no-ops and the stored row is CANCELLED but the service's cancellation intent differs, overwrite with the service's state. Other terminal states are left alone.
Tests (run locally before submit): new regression test test_shutdown_overwrites_scenario_cancelled_write_with_interrupted (scenario mock mirrors real Scenario.run_async: writes CANCELLED, then re-raises; try_update mock is CAS-faithful) plus the full test_scenario_run_service.py and test_scenario_resume.py files — 289 passed. Negative control: with the service fix stashed, the new test fails with the row staying CANCELLED. Note: ruff was not run here (binary absent from the local venv).
Closes #3746

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[Copilot]

🟡 Changes recommended

The shutdown fallback’s separate check and unconditional update can race with a concurrent resume, incorrectly overwriting the run’s IN_PROGRESS or COMPLETED state with FAILED.

1 open issue

• Prevent shutdown from overwriting a resumed run state · New

What changed in this PR

Addresses #3746 by preserving shutdown-interruption status for active scenario runs, keeping them eligible for saved-config resume.

Changes:

• Adds a fallback to persist FAILED/ScenarioInterruptedError when scenario cancellation has already written CANCELLED.
• Adds a regression test that reproduces this write ordering with state-aware mocks.

File	Description
tests/​unit/​backend/​test_scenario_run_service.py	Tests shutdown persistence after the scenario writes CANCELLED.
pyrit/​backend/​services/​scenario_run_service.py	Adds fallback persistence for shutdown cancellation intent.

_{Review effort: Balanced}