chore(release): align Viewer 5.21.10 product SHA

[Shuang-su]

回填 PR #140 正常 squash 后的实际产品 SHA，保持 metadata/public Version History、index.release 与 Ledger 一致。产品代码、100 项资源对象与 Editor/Director 不变。

Validation: 160 单测、版本镜像、release contract 和 diff 检查；产品精确 HEAD CI 38037012781 全通过。正式 tag/build 和 Netlify 候选、生产回读及 15 分钟观察完成后追加。

Refs #139

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Note

Low Risk
Documentation and JSON release pointers only; no viewer, resource, or runtime code changes.

Overview
Updates Viewer 5.21.10 release metadata to the squash-merged product commit 92958b569259e9cf1918efe0c006071b4fef2458 (PR #140), replacing the prior candidate SHA e72cff4d everywhere it was recorded.

data/index.json release.gitRef, data/version-history.json and metadata/version-history.json (documentedThrough, current.gitRef, and the 5.21.10 entry) now point at the same product SHA. Display version 5.21.10 and functional release notes are unchanged; this is bookkeeping only.

docs/changes/139-viewer-safari-loading/verification.md adds a 最终产品合并 section (squash SHA, CI 38037012781, production still on 5.21.9). docs/metaflow-viewer-change-ledger.md adds a matching product ledger line for the merged SHA.

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-10T08:25:11.111740Z	53ef3df	PR opened

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Reviewed commit: 53ef3dfd4f

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[chatgpt-codex-connector]

Preserve candidate refs before replacing the release entry

Replacing the 5.21.10 entry’s gitRef removes e72cff4d... from the canonical Version History, while the newly documented final candidate 7328de7b... is also absent from maintenanceCommits; consequently, the machine-readable provenance no longer contains either candidate even though the Ledger says the candidate chain is preserved. Append those candidate refs to the history before pointing the current/product entry at the squash SHA, as was done for 5.21.9, rather than losing historical records during this update.

AGENTS.md reference: AGENTS.md:L67-L67

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