fix: prevent Emulator archive dates from masking version rollback

[inferjay]

PR #96 introduces an official archive entry for Canary 37.3.1 dated Oct 07, after Canary 37.3.3 dated Oct 06. The updater preserves archive order for rendering/reporting; its existing date-first key only guards transitions. This makes a lower Canary revision appear as latest and permits a newer date to hide a downgrade.

This change sorts only Emulator entries by numeric revision (date/name break ties), preserving every validated entry and its official dates/download metadata. Rollback checks compare maximum numeric revisions within every previously present channel, including unsorted legacy pages; loss of a channel also fails closed. Studio ordering, download validation, Repository XML policies, generated markers, write allowlist, and review-PR workflow remain intact. Numeric revision is the site's latest-version policy; archive dates are metadata, not an installation-upgrade order. Existing Emulator history will be reordered under that policy.

Validation: 23 offline tests pass, including an official two-release fixture, 37.3.10 vs 37.3.9, channel loss/regression hidden by a newer stable, unsorted old pages, date corrections, generated homepage/archive order, no-change reruns, and zero page writes on rollback. A check against PR #96 using downloaded official Studio/Emulator/XML snapshots retains all 217 Emulator entries, reports 37.3.3 as latest, and changes only android-emulator.html/index.html.

PR #96 audit (2026-10-08 UTC)

• Official archive: https://developer.android.com/studio/emulator_archive
• Exact frame: https://developer.android.com/frame/studio/emulator_archive_0702fd5f930c181b7a3a78f9568f9f269f680542f4d304c176ae6f125dc24ded.frame
• SDK Repository XML: https://dl.google.com/android/repository/repository2-3.xml
• 37.3.1 Canary: Oct 07, 2026, build 16373887.
• 37.3.3 Canary: Oct 06, 2026, build 16489710.
• Both PR entries exactly match official dates, URLs, platform labels, sizes and checksums. Current XML channel-2 points to 37.3.3 and the same four build-16489710 filenames/sizes.
• All eight ZIP downloads were streamed in full and their actual byte counts/SHA-256 matched the official archive:

File	Bytes	SHA-256
emulator-linux_x64-16373887.zip	353795619	e8f46e19b8dedad03f2387caa2676a6d9b0ddbb3db850202167346da75098260
emulator-darwin_x64-16373887.zip	492796833	903400cabc3d684c8a7d463524990e508412de849a78a00772c22e865d0241e6
emulator-darwin_aarch64-16373887.zip	419849447	9d0f6ae4f27a886d947098bb6f5f3148a3f2217ce4a58cb81dbec0222da68d21
emulator-windows_x64-16373887.zip	459169650	b294385071f0dad738308b91c60f605c4a817c617352136a0b5625e1f800e359
emulator-linux_x64-16489710.zip	353959232	a0da0fa20903a69ae52ab501f30fc5c768dcce31434cd2f55d52addc1a2c0495
emulator-darwin_x64-16489710.zip	493027673	1829806279af5365812cc2d22c9d292a535b2157c99575378d2e8e6ede2704b5
emulator-darwin_aarch64-16489710.zip	420070680	c2efd240c708f7f900a100d398faa606cc96ff1b1932805df78b8c4cc272fdd4
emulator-windows_x64-16489710.zip	459469167	b9c90996c4ebca457e3e5dfd61ed2c74227a6f7ffc3a382db5ced8d37da15cbe

Recommendation: hold PR #96 at 9116ea2. Its download data is valid, but its latest-version presentation/report is misleading. Review/merge this independent script fix first, then regenerate the update PR and review the corrected ordering/report. This PR does not merge or modify #96 and does not change scheduling.

[chatgpt-codex-connector]

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-08T09:23:40.400876Z	3513e1b	PR opened

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Reviewed commit: 3513e1bfc3

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[chatgpt-codex-connector]

Avoid exceeding the workflow's diff-size guard

On the first run against the existing source/date-ordered gh-pages archive, sorting the entire Emulator history rewrites most historical blocks rather than only correcting the latest entries. Using tests/fixtures/emulator-frame.html to compare the prior rendered order with this order produces 1,023 additions plus 1,023 deletions for android-emulator.html alone, so the subsequent Fail if the update escaped its allowlist step in .github/workflows/update-android-downloads.yml rejects the change because it caps the combined diff at 2,000 lines; the workflow therefore never reaches PR creation. Limit numeric ordering to latest-version selection or coordinate this migration with the workflow guard.

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