test: Add bytecode cache tests and dev boot time CI workflow
Add comprehensive unit tests for the bytecode cache functionality:
- Test loading modules and returning exports
- Test working with Node.js built-in modules
- Test cache creation and metadata
- Test error handling for syntax errors
- Test ES module style exports
- Test isBytecodeCacheEnabled flag
- Test clearBytecodeCache function
- Test cache invalidation on source changes
- Test correct __filename and __dirname context
Add GitHub Action workflow for dev boot time regression testing:
- Benchmarks cold start (fresh .next) and warm start (with bytecode cache)
- Runs on PRs that modify CLI or server startup code
- Reports results in GitHub Actions summary
- Fails if cold start exceeds 2000ms threshold
- Runs bytecode cache unit tests
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
