Update CONFIGURATION.md with ENV Cleanup Phase 1-3 results
Added new section "Debug Variables (Gated in Release Builds)" documenting:
- 13 debug variables now compiled out in HAKMEM_BUILD_RELEASE=1
- 4 production config variables preserved (intentional)
- Performance impact: +1.0% (30.2M → 30.5M ops/s)
Updated sections:
- Header: Last Updated 2025-11-28
- Recent Changes: Added Phase 1-3 entry
- FAQ: Added Q&A about gated debug variables
- See Also: Added link to ENV_CLEANUP_TASK.md
Variables documented:
- Core debug: TINY_ALLOC_DEBUG, TINY_PROFILE, WATCH_ADDR
- Trace/timing: PTR_TRACE_*, TIMING
- Freelist: TINY_SLL_DIAG, FREELIST_MASK, SS_FREE_DEBUG
- SuperSlab: SUPER_LOOKUP_DEBUG, SUPER_REG_DEBUG, SS_LRU_DEBUG, SS_PREWARM_DEBUG
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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