feat(playwright): make demo-video call the evidence posting step #11392

Parent

Refs #8651. Evidence-verification plan: Brief and acceptance criteria at #11364 (comment); Design and Plan comments are on #11364.

Depends on

• feat(source-control): add the pull-request evidence posting step #11391

Outcome

demo-video posts evidence through /source-control:pull-request evidence when it resolves, and its own person-requested demo attach keeps its current fallback text.

Demo: run /skill-quality:check demo-video; the updated eval passes.

Plan (phase S5b)

Satisfies: AC8
Size Small. Depends on: S5a (#11391). Plugin: playwright.

• First: grep -rn "posting.md" plugins/playwright and list consumers (known: plugins/playwright/skills/demo-video/evals/evals.json:53).
• Replace reference/posting.md with a presence-gated call to /source-control:pull-request evidence; demo-video's own person-requested demo attach (outside evidence verification) keeps its current fallback text. Update the eval at line 53.
• Run budget: at most 2 runs per eval case; stop on the first usage-limit error.
• Sanity Check: test ! -f plugins/playwright/skills/demo-video/reference/posting.md || grep -q "source-control:pull-request evidence" plugins/playwright/skills/demo-video/reference/posting.md; /skill-quality:check demo-video PASS.

Design excerpt

• source-control: /source-control:pull-request evidence posts one marker comment (local
  gh --attach; CI from source-control-babysit-merge after PASS, before enqueue); create.md's
  Visual evidence updated; playwright demo-video's reference/posting.md moves here, demo-video
  calls it.

Acceptance criteria

Brief criteria this slice satisfies:

• AC8: A passing PR carries one comment linking redacted evidence; account and usage lines never appear in uploaded captures.

Done when:

• Sanity Check passes: test ! -f plugins/playwright/skills/demo-video/reference/posting.md || grep -q "source-control:pull-request evidence" plugins/playwright/skills/demo-video/reference/posting.md; /skill-quality:check demo-video PASS.
• The consumer list from grep -rn "posting.md" plugins/playwright is recorded in the PR body
• The plugin's version and CHANGELOG are bumped per the repository's release convention
• ci-status is green on the PR head

Held for owner decision

Dependencies only; no scope is carved out of this slice. It depends on S5a (#11391).

🤖 Generated with Claude Code

https://claude.ai/code/session_01UJUn7KoThXoYQoxfvdCVi7