TinyHeapV2: Enable by default with optimized settings
Changes:
- Default: TinyHeapV2 ON (was OFF, now enabled without ENV)
- Default CLASS_MASK: 0xE (C1-C3 only, skip C0 8B due to -5% regression)
- Remove debug fprintf overhead in Release builds (HAKMEM_BUILD_RELEASE guard)
Performance (100K iterations, workset=128, default settings):
- 16B: 43.9M → 47.7M ops/s (+8.7%)
- 32B: 41.9M → 44.8M ops/s (+6.9%)
- 64B: 51.2M → 50.9M ops/s (-0.6%, within noise)
Key fix: Debug fprintf in tiny_heap_v2_enabled() caused 20-30% overhead
- Before: 36-42M ops/s (with debug log)
- After: 44-48M ops/s (debug log disabled in Release)
ENV override:
- HAKMEM_TINY_HEAP_V2=0 to disable
- HAKMEM_TINY_HEAP_V2_CLASS_MASK=0xF to enable all C0-C3
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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