chore(sync): update registry and README

[github-actions]

Automated registry resync from scripts/sync.mjs.

Touches:

• registry.json — entry-level head_sha, last_validated_at,
  and any newly drifted entries.
• README.md — rendered entry table.
• site/stats.json, site/badges/, site/.well-known/ —
  regenerated derivatives.

Auto-merges once required status checks pass.

[Copilot]

Pull request overview

Automated registry resync output updating the registry metadata and the site/README derivatives to reflect the latest sync state.

Changes:

• Refreshed generated timestamps in registry.json and site/stats.json.
• Updated per-repo last_synced / drift_checked_at values in registry.json and .well-known repo listing.
• Regenerated the README entries table to reflect the new “Last synced” dates.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
site/stats.json	Updates generated_at timestamp for regenerated site stats.
site/.well-known/repos.json	Refreshes last_synced timestamps for published repo metadata.
registry.json	Refreshes registry generated_at and per-entry sync/drift timestamps.
README.md	Regenerates the auto-rendered entries table with updated “Last synced” dates.

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