Validate UI evidence (a screenshot for simple cases, a video for complex flows) against the bug or plan being verified plus usage scenarios — the inverse of kitsoki-ui-demo. Picks the evidence form by complexity, extracts deterministic frames, has a read-only `claude` vision agent judge each scenario against cited frames AND whether the evidence is complete for the stated bug/plan, adversarially re-checks every pass, and emits a gated qa-report.md + verdict.json. Use when asked to QA / review / validate / sign off on a demo, walkthrough, screenshot, or bug-fix proof, or to gate one in CI.