Refactor PBO to PGO with true Profile-Guided Optimization

- Rename PBO (Profile-Based) to PGO (Performance Guided Optimization)
- Implement true PGO using Go's -pgo compiler flag
- Refactor script into maintainable functions:
  - setup_environment(): Initialize paths and variables
  - create_test_file(): Generate 100MB test file with 1M lines
  - build_baseline(): Build version without PGO optimizations
  - collect_training_data(): Generate CPU profiles for training
  - build_pgo_optimized(): Build with -pgo flag using training profile
  - run_pgo_performance_test(): Profile PGO-optimized version
  - run_performance_comparison(): Compare baseline vs PGO performance
  - generate_detailed_analysis(): Create comprehensive profile analysis
  - cleanup(): Remove temporary files
  - show_summary(): Display results and process summary
- Update Makefile target from 'pbo' to 'pgo'
- Update .gitignore patterns for PGO temporary files
- Update CLAUDE.md documentation for new PGO process
- Remove git stash dependencies for simpler automation
- Generate before/after performance comparison reports

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

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