Auto QA PR (UI verification)

Run the app locally, exercise the changed surfaces through a real browser, and produce concrete visual evidence — screenshots plus a pass/fail report. When a tracker is configured and a PR number is given, hand that evidence to reviewers as a PR comment (and, opt-in, sign the PR off). When there is no tracker, save the evidence as artifacts so a human can review it. Either way, the skill is read-only on source code: it never edits files, never pushes to the change's branch, and never merges.

This skill never boots the app itself — om-prepare-test-env provisions a runnable instance and writes a descriptor this skill reads, so QA is identical across stacks and shares one instance with integration tests.

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