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Restore green CI on main: ruff B905 (zip strict=) from 6db5c2b3 blocks the quality job

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
35/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Active
Tech stack
python
Domain
ci-cd, devops, testing-qa

Research direction

Start at courses/tests/test_course_illustrations.py:127 and verify the B905 failure against the quality contract. Confirm the full quality, typecheck, and format-check targets pass, then re-run django, playwright, and Deploy Dev at the fixed main head; remaining failures should be attributed to an owning issue.

Written by the indexing model from the issue text.

Description

bug P1 testing

Observed by on-call after the #382 merge push (d7e53f5f, CI run 35010874544) and confirmed pre-existing.

Evidence

  • Job quality fails: ruff B905 zip() without explicit strict= at courses/tests/test_course_illustrations.py:127. Reproduced locally at d7e53f5f with the exact CI command. Introduced by 6db5c2b3 (pushed 18:11Z); quality passed at the prior head 55a400c7 (15:56Z).
  • Because the quality contract aborts on first failure, django/playwright were cancelled at b297191d and d7e53f5f. Deploy Dev verify-ci failed, deploy skipped.
  • Independent pre-existing red: at 55a400c7 (quality green), django failed with failures=16, errors=1 and playwright failed (accessibility/article-parity among them). Attribution of those to introducing commits is still open; do not treat them as acceptable.

Acceptance criteria

  • B905 fixed (strict=True; the zipped literals are equal-length) and the full quality contract passes locally, not just to the first failure
  • typecheck and format-check targets re-run clean (separate assert is not None narrowing and reflow fixes are in flight in the shared checkout)
  • push to main re-observed: quality, django, playwright jobs all green or each remaining failure attributed to an owning issue
  • Deploy Dev goes green at the fixed head

Fix is in progress in the shared main checkout (uncommitted at time of filing); commit with Refs #N pointing at this issue.

Dominant language
Python
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