feat(ci): auto-sync the MCP known-latest constant, never a manual bump

[JSONbored]

Summary

• apps/loopover-ui/src/lib/mcp-package.ts's MCP_PACKAGE_KNOWN_LATEST_VERSION is a client-side graceful-degradation fallback (shown only when the live npm registry fetch fails or hasn't resolved yet). ui:version-audit already requires it to track @loopover/mcp's real npm dist-tags.latest, but the only way to fix a drift was a manual edit — this repo just hit that exact failure on main.
• Adds a --write mode to scripts/check-ui-mcp-version-copy.mjs that self-heals the constant instead of failing when the registry check is run with it.
• Adds a new scheduled workflow (.github/workflows/mcp-ui-version-sync.yml, daily cron + workflow_dispatch) that runs the sync and keeps a standing PR up to date, mirroring orb-stable-release-pr.yml's existing pattern (force-pushed branch, gh pr create/gh pr edit).
• Nothing ships without a maintainer merging the PR — this workflow never pushes to main directly. CI's own invocation of ui:version-audit never passes --write, so a genuine drift introduced by a contributor PR still fails loud as before.

Scope

• scripts/check-ui-mcp-version-copy.mjs, scripts/check-ui-mcp-version-copy.d.mts, package.json, test/unit/check-ui-mcp-version-copy-script.test.ts, .github/workflows/mcp-ui-version-sync.yml
• No other files touched

Validation

• npx tsc --noEmit — clean
• npx vitest run test/unit/check-ui-mcp-version-copy-script.test.ts — 14/14 passed (new tests cover writeKnownLatestVersion directly and the --write CLI mode end-to-end against a disposable temp repo layout, never the real source file)
• npm run ui:version-audit (no --write) — still passes cleanly, unaffected
• npm run ui:version-audit:sync (new script, --write mode) — confirmed no-op when already in sync
• npm run actionlint — clean on the new workflow

Safety

• No secrets touched (workflow uses the default github.token, same as orb-stable-release-pr.yml)

[superagent-security]

Superagent didn't find any vulnerabilities or security issues in this PR.

[codecov]

Bundle Report

Bundle size has no change ✅

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.64%. Comparing base (42805e0) to head (68e4414).
⚠️ Report is 3 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
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  Coverage   93.64%   93.64%           
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  Files         680      680           
  Lines       68026    68026           
  Branches    18673    18673           
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  Hits        63704    63704           
  Misses       3347     3347           
  Partials      975      975           

Flag	Coverage Δ
shard-1	44.02% <ø> (+<0.01%)	⬆️
shard-2	36.78% <ø> (ø)
shard-3	32.41% <ø> (ø)
shard-4	34.76% <ø> (ø)
shard-5	30.97% <ø> (ø)
shard-6	45.71% <ø> (ø)

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