docs: record source-only mainline closure

[fananly233]

Summary

• record PR chore: adopt source-only release policy #2's privacy-safe active two-parent merge and the superseded immutable GitHub metadata residual without publishing the private address
• record passing mainline CI #19 and artifact-free Windows clean-machine run #7
• record permanent deletion of historical unsigned artifact IDs 9496313691, 9498181296, and 9499997749 while retaining their workflow runs and logs

Validation

• npm run check:publish
• RELEASE_TAG=pi-gui-v0.1.0 npm run check:release
• npm run check
• npm test (26 passed)
• npm run build:frontend
• cargo check --locked --manifest-path src-tauri/Cargo.toml
• cargo test --locked --manifest-path src-tauri/Cargo.toml --lib (25 passed, 1 network test ignored)
• npm audit (0 vulnerabilities)
• git diff --check
• fresh GitHub API checks report zero artifacts for all three historical source runs, CI #19, and clean-machine #7

Scope

Docs only. This PR does not create a tag, Draft, or Release, and does not access or configure signing credentials.

[Copilot]

🟡 Changes recommended

A few newly added documentation statements are internally inconsistent or less-auditable than adjacent established conventions, and should be clarified for accuracy.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

This PR updates project documentation to record the completed source-only mainline integration of PR #2, associated CI/clean-machine validation, and the permanent deletion of historical unsigned GitHub Actions artifacts while retaining workflow runs/logs.

Changes:

• Mark source-only policy merge and historical artifact deletion as completed in tracking/checklist docs.
• Add Phase 10C “mainline closure” records (CI #19, clean-machine #7, artifact deletions, and the PR #2 metadata residual note).
• Update release criteria/evidence narratives to reflect the new Phase 10C records.

File summaries

File	Description
TODO.md	Marks artifact cleanup and source-only policy merge as completed checklist items.
RELEASE_CRITERIA.md	Records historical artifact deletion and updates integration evidence narrative with Phase 10C.
MIGRATION_MATRIX.md	Adds Phase 10C “source-only mainline closure” evidence block.
docs/RELEASES.md	Extends the recorded evidence timeline with Phase 10B/10C items and artifact deletion note.
docs/RC_ACCEPTANCE.md	Adds Phase 10C revalidation section and replaces artifact link with deletion-retained evidence text.

Review details

• Files reviewed: 5/5 changed files
• Comments generated: 3
• Review effort level: Lite

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