Summary

tests/qa/test_08_end_to_end.py fails pytest collection with a CheckpointValidationError because the fixture's edit_decisions artifact omits the required render_runtime field.

Repro

$ python3 -m pytest --collect-only tests/qa/test_08_end_to_end.py
ERROR collecting tests/qa/test_08_end_to_end.py
lib.checkpoint.CheckpointValidationError: Artifact 'edit_decisions' failed schema validation: 'render_runtime' is a required property

Root cause

schemas/artifacts/edit_decisions.schema.json declares render_runtime in required. The test fixture constructs an edit_decisions dict with version, cuts, music, subtitles — but no render_runtime. Per AGENT_GUIDE.md the runtime is supposed to be locked at proposal and carried through edit_decisions; the test predates that hard-rule.

Impact

• All tests blocked from collecting (pytest exits with Interrupted: 1 error during collection).
• 344 tests passing in collection but pytest exits non-zero overall.

Fix

Add 'render_runtime': 'ffmpeg' (or another valid runtime) to the test fixture's edit_decisions dict. Also worth updating downstream tests that consume this fixture if they don't already pass through the field.

Acceptance

• python3 -m pytest --collect-only exits 0 with no errors
• tests/qa/test_08_end_to_end.py collects without CheckpointValidationError