fix: repair exact image index assembly

[ndizazzo]

Summary

• fix the invalid jq scope in exact tested-image index assembly
• execute the workflow's exact filter in regression tests
• add an optional fail-closed expected upstream SHA input for manual recovery

Validation

• full TypeScript suite: 93/93
• focused workflow tests: 13/13
• matrix validation
• actionlint
• git diff --check

v0.75.0 recovery

After merge, an image-only main dispatch will pin expected_mesh_sha=0ddaa87d4a24e5ec7c891afccf515748298b7027, set dry_run=false, publish images only, and consume checksum-verified v0.75.0 release artifacts without rebuilding MeshLLM source.

Summary by CodeRabbit

• Bug Fixes

  • Improved release validation to prevent image releases from using an incorrect upstream revision.
  • Strengthened image-index checks to ensure all staged results match the selected release matrix.
  • Fixed exact image-index assembly issues that could affect published releases.

• Tests

  • Added coverage for valid, invalid, mismatched, uppercase, and malformed revision values.
  • Added regression checks for image-index filtering and matrix consistency.

[coderabbitai]

📝 Walkthrough

Walkthrough

The release workflow now validates an optional immutable upstream tag SHA and uses explicit matrix-row binding for image-index checks. Regression tests cover SHA validation and mismatched staged image results.

Changes

Release workflow validation

Layer / File(s)	Summary
Expected upstream SHA validation .github/workflows/images-release.yml, tests/release-workflow.test.ts, TODO.md	The workflow accepts an optional lowercase 40-character SHA and verifies it against the resolved upstream tag commit. Tests cover empty, matching, uppercase, malformed, and mismatched values.
Image-index matrix validation .github/workflows/images-release.yml, tests/release-workflow.test.ts	The jq filter binds each matrix row before comparing it with staged results. Tests verify matching rows pass and backend mismatches fail.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Possibly related PRs

• Mesh-LLM/mesh-packaging#16: Introduced the exact image-index assembly and validation refined by this PR.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: repairing exact image index assembly.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/fix-oci-index

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