fix: post-sync patch for stable FakeTSVersion help baselines

[buke]

Summary

• Help baselines drift whenever the real TypeScript version string length changes (header padding uses the live version). Tests now pin TS_TEST_VERSION / FakeTSVersion via versionForDisplay, and accepted baselines match that fixed padding.
• After sync-internal.sh copies upstream sources (which wipe local harness edits), scripts/post-sync.sh re-applies scripts/patches/0001-ts-test-version-stable-help-padding.patch and refreshes the version-sensitive show-help baselines.
• Together with sync.yml skip-same-tag (ci(sync): skip when already on target TypeScript tag #269), this prevents daily no-op sync PRs and stops version-length baseline churn on real syncs.

Test plan

• go test ./pkg/execute/tsctests/ -count=1 -run 'TestTscCommandline$/tsc/show_help' green after baseline accept
• ./scripts/post-sync.sh succeeds twice (idempotent: patch already applied, baselines stable)
• CI green on PR

[codecov]

Codecov Report

❌ Patch coverage is 92.85714% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 54.29%. Comparing base (02a3140) to head (e5ff8bb).

Files with missing lines	Patch %	Lines
pkg/execute/tsc/help.go	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #270      +/-   ##
==========================================
- Coverage   54.31%   54.29%   -0.02%     
==========================================
  Files         436      436              
  Lines      153791   153801      +10     
==========================================
- Hits        83526    83512      -14     
- Misses      64591    64613      +22     
- Partials     5674     5676       +2     

Flag	Coverage Δ
unittests	54.29% <92.85%> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.