release(main): carry verified checksum and signature repair

[lidge-jun]

Summary

• Repair the two producer/verifier mismatches blocking desktop publication. Standalone checksum filenames now retain the archive extension. The updater verifier now decodes Tauri's outer-base64 minisign box and verifies its ED/BLAKE2b-512 signature plus the trusted-comment signature against the pinned key.
• Add an independent, attributed minisign 0.7.3 vector and rejection cases for altered payloads, signatures, comments, keys and malformed envelopes. Preserve asset counts, checksums, signature requirements and publication ordering.
• Ten independent Sol reviewers inspect only this release-verification issue. Unrelated regression work is excluded. This is the owner-authorized main promotion of merged dev PR fix(release): align checksum and Tauri signature verification #5544 (2b8b007). Channel versions are unchanged. The owner explicitly requested immediate integration and verification on main/preview only; dev CI is cancelled.

Verification

• Hosted evidence: https://github.com/lidge-jun/opencodex/actions/runs/35721661559. All eight packaging jobs passed, including Apple notarization Accepted and bundle signature verification. Final verification failed on five checksum names.
• Inspection of that run's actual MSI signature confirmed Tauri's four-line outer-base64 ED format. Pinned Tauri CLI 2.11.1 and minisign 0.7.3 source establish the prehash and global signature protocol.
• Independent upstream test vector comes from jedisct1/rust-minisign commit 068d25a2fffd3d9da96e43f3844c830d8176d5a0 with its license retained.
• Local tests, builds, typechecks and cryptographic execution: NOT RUN by owner instruction. Commit/push use --no-verify. Exact-head hosted tests and real artifact verification remain required; no source review is represented as an executed test.

Checklist

• Scope stays focused and avoids unrelated cleanup.
• Docs or release notes were updated when needed.
• Security-sensitive changes were reviewed for secrets, auth, and unsafe defaults.

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📥 Commits

Reviewing files that changed from the base of the PR and between b007d33 and 82644fd.

📒 Files selected for processing (7)

• .github/workflows/release.yml
• desktop/scripts/verify-release-assets.ts
• structure/desktop-shell.md
• tests/ci-workflows/release-desktop-scripts.test.ts
• tests/ci-workflows/release-pipeline-contract.test.ts
• tests/fixtures/minisign/LICENSE
• tests/fixtures/minisign/prehashed-vector.json

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