Add automated tests, release QA, and bug-bash checklist

[honor2030]

Goal

Reduce launch risk enough that a solo builder can ship without spending the first week firefighting.

Acceptance criteria

• Core units have repeatable automated coverage.
• One smoke test covers the critical path (upload → match → review → export → unlock).
• A manual pre-launch checklist exists and is completed before release.

Task list

• Add unit tests for normalization, scoring, and export adapters.
• Add one e2e smoke test (Playwright).
• Create manual bug-bash checklist.
• Log and fix critical P0 bugs found during QA.

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Estimate: 0.5–1 day