Alexander Whitestone d750ca4224 feat: Safety wrapper and constant-time implementation (#55) ...

Safety wrapper (llama-turbo.h, llama-turbo.cpp):
- Input validation (dimension must be power of 2, 16-4096)
- Null pointer checks
- Invalid norm detection (NaN/Inf/negative)
- Error codes for all failure modes
- Safe API: polar_quant_encode_turbo4_safe()

Constant-time quantization:
- ct_fabsf: bitwise absolute value (no branches)
- ct_select: bitwise selection (no branches)
- Always examines all 16 centroids
- No data-dependent branches in packing

Metal shader (ggml-metal-turbo.metal):
- Buffer bounds checking on all accesses
- Invalid norm handling (outputs zeros)
- Thread ID validation
- Constant-time dequantization kernel

Tests (tests/test_safety.py):
- 15 tests, all passing
- Power of 2 validation
- Dimension bounds checking
- Buffer size verification
- Packing correctness

Closes #55

2026-04-14 22:14:51 -04:00

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