docs(debugger): restore high-value examples and patterns
- Add rich code examples for investigation techniques (minimal
reproduction, working backwards, differential debugging, etc.)
- Restore test-first debugging pattern with full process
- Add stability testing examples (parallel stress, race condition)
- Add hypothesis testing pitfalls table
- Add research vs reasoning decision tree and red flags
- Add combining techniques guidance
990 → 1,184 lines (+194 lines of actionable content)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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