build(android): forward-split verified supply chain from PR 108

[RXWatcher]

Purpose

This is forward-split slice A from archival integration PR #108, rebuilt as a coherent net diff on current main. PR #108 remains the historical integration reference and is not superseded or merged by this draft.

Scope

• lock every resolvable Gradle configuration and commit slice-specific lock state
• require strict SHA-256 dependency verification, including the Linux AAPT2 classifier
• pin the Gradle distribution and every external GitHub Action
• pin and verify the checked-in Dolby Vision bridge source, toolchains, ABI outputs, notices, and AAR
• document original-commit-to-slice traceability

The verification metadata was regenerated for this narrower slice. It does not pre-trust dependencies introduced by later PR 108 slices.

PR 108 traceability

Original work mapped here: 5fe404f2, 0b349126, dd263997, 3b090b62, ccd22376, f3d62d19, c4791257, and 445b5f39. Exact dispositions and rationale are in docs/notes/2026-07-27-pr108-forward-split-traceability.md.

Forward-split commits: 74308e48, 39379263, c8a08e18, e4ec5880, and documentation correction 19bf0dd7.

Verification

Passed locally without metadata-writing flags:

• ./scripts/test-check-build-supply-chain.sh
• ./scripts/check-build-supply-chain.sh
• ./scripts/build-dovi-aar.sh --verify-provenance
• ./gradlew testDebugUnitTest :androidApp:assembleRelease :androidTvApp:assembleRelease --no-daemon --max-workers=2
• git diff --check

The first release build exposed 26 lint/release-tool artifacts not traversed by the generic resolver or unit tests. Their recorded hashes exactly match PR #108 metadata; an independent reviewer additionally fetched and verified them from Google Maven/Maven Central. The Linux AAPT2 hash was independently downloaded from Google Maven and is enforced by a regression fixture.

Independent code review found no remaining Critical, Important, or blocking Minor issues.

Remaining acceptance gate

Before release, test the rebuilt Dolby Vision artifact on an NVIDIA Shield with Profile 7 conversion, HDR fallback, seeking, and sustained playback. This draft does not claim that hardware validation.

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: acaa8e2f-931c-492e-8bb0-dac006980707

📥 Commits

Reviewing files that changed from the base of the PR and between da26f08 and 5a34a95.

⛔ Files ignored due to path filters (1)

• android-shared/src/native/dovi/Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (21)

• .github/workflows/android-build.yml
• .github/workflows/release.yml
• THIRD_PARTY_NOTICES.md
• android-shared/gradle.lockfile
• android-shared/libs/silo-dovi-bridge-2.3.1.aar
• android-shared/src/native/dovi/THIRD_PARTY_NOTICES.txt
• android-shared/src/native/dovi/provenance.json
• androidApp/gradle.lockfile
• androidTvApp/gradle.lockfile
• baselineprofile/gradle.lockfile
• build.gradle.kts
• docs/notes/2026-07-27-pr108-forward-split-traceability.md
• docs/superpowers/plans/2026-07-27-pr108-slice-a-supply-chain.md
• gradle/verification-metadata.xml
• gradle/wrapper/gradle-wrapper.properties
• libass-bridge/gradle.lockfile
• scripts/build-dovi-aar.sh
• scripts/check-build-supply-chain.sh
• scripts/test-check-build-supply-chain.sh
• settings-gradle.lockfile
• shared/gradle.lockfile

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch split/108-a-supply-chain

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