chore: add dev boot profiling and benchmark scripts
- benchmark-boot-time.sh: Wall-clock benchmark with two metrics
- benchmark-next-dev-boot.js: Multi-iteration benchmark with stats
- profile-next-dev-boot.js: CPU profiling infrastructure
- analyze-*.js: Profile and bundle analysis tools
- trace-cli-startup.js: Module loading trace
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>