docs: explain protocol 1.5 releases and link component sources

[kristoferlund]

Summary

• Separate reviewed protocol release notes from imported technical component changelogs; document protocol 1.5 from the published Lexicon 1.5.0 release.
• Restore visible protocol-release navigation, keep the Releases overview concise, and remove documentation-repository commits from release highlights.
• Link component release pages to their owning GitHub repositories. The new SDK repository remains unconfirmed; the linked legacy SDK is explicitly marked deprecated.
• Document the human release review step for the Lexicon changelog and protocol notes.

Validation

• pnpm test (81 passed)
• pnpm run build
• pnpm run check:links
• git diff --check

Follow-up

The reference schema tables are still pinned to @hypercerts-org/lexicon@1.4.1 and should be updated separately. This PR does not change Lexicon publishing automation or publish a package.

[vercel]

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Project	Deployment	Actions	Updated
hypercerts-v0.2-documentation	Ready	Preview	Oct 16, 2026 1:25pm UTC

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