feat(ci): auto-generate loading tips from release metadata

[jeremyeder]

Summary

• Adds scripts/generate-loading-tips.py that generates dynamic loading tips from git history
• Integrates into the release pipeline between changelog generation and tag creation
• Tips highlight first-time contributors and top 3 commits by lines of code added

Example output (v0.1.0)

1. Welcome Aidan Reilly, who made their first contribution in v0.1.0!
2. New in v0.1.0: fix technical inaccuracies and add undocumented feature coverage (+926 lines)
3. New in v0.1.0: git credential helper for proper repo authentication (+276 lines)
4. New in v0.1.0: [Amber] Fix: Bug: Loading custom workflow from private GitHub repo downloads no files (+150 lines)

Test plan

• Run python3 scripts/generate-loading-tips.py v0.1.0 v0.0.35 ambient-code/platform /tmp/test.ts locally
• Verify generated TypeScript is valid
• Trigger a test release to confirm pipeline integration

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/auto-loading-tips

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