feat: perceptual hashes (aHash/dHash) - #70
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Adds Image::average_hash(), Image::difference_hash() -> UInt64 and hamming_distance(a, b). Thumbnails use exact region-mean luma (integer accumulation) so hashes are deterministic across backends. 6 new tests: hand-computed half/half aHash (exactly the 32 right bits), 4x upscale invariance, inversion flips all 64 bits, dHash gradient signatures (64 vs 0), brightness-shift invariance, Hamming arithmetic. 157/157 tests passing. Closes #67