chore(release): record 3.1.2 channel completion

[wybaby168]

Summary

• Record the completed 3.1.2 rollout with zero audited channel gaps.
• Make status-only CI skip runtime checks that require build outputs, while keeping repository governance and metadata checks.
• Backport the workflow guard to the private source after the frozen 3.1.2 postcheck; do not alter the release candidate.

Related Issue

N/A: this is release-status and CI maintenance for the completed 3.1.2 rollout.

Change Classification

• User-visible UI or rendering change
• Non-visual change
• File-format or renderer behavior
• Public API, package, Worker, WASM, or deployment-path change

Verification

Check	Result
pnpm release:status:write	Pass: 100 Release assets, 89 npm packages, 17 component repositories, zero gaps
node --test .github/scripts/release-ci-impact.test.mjs	Pass
pnpm verify:github-governance	Pass
Public CI and PR governance on this head	Required before merge

Sample / Fixture Evidence

N/A: only release metadata and CI conditions change; no renderer input or sample is affected.

Visual Evidence

N/A: non-visual release metadata and CI maintenance.

Risk And Compatibility

• Affected packages/formats: no package or format bytes; only artifacts/release-status.json and the public status-only CI path.
• Compatibility or migration risk: none for consumers; runtime regressions still run for runtime changes.
• Rollback: revert this metadata/CI commit without moving the immutable v3.1.2 tag or replacing npm bytes.

Checklist

• I added or updated focused automated coverage, or explained why it is not needed.
• I updated user-facing documentation or release notes when behavior or API changed, or marked them not applicable.
• I verified offline/private-deployment paths when changing Worker, WASM, fonts, vendor assets, or URLs, or marked them not applicable.
• I did not commit secrets, customer files, private samples, generated caches, or unrelated changes.