KarpelesLab / anyhash / 24209997301

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Fix PHP cross-compatibility for md5, crc32b/c, murmur3a state encoding

- MD5: read state words as big-endian from Go's binary format (was LE)
- CRC32B/C: complement state during marshal/unmarshal (Go stores
  complemented CRC, PHP stores raw)
- Murmur3A: fix carry byte packing to match PHP's MSB-first layout
- Add TestPHPCrossValidation: verifies Go's MarshalPHP int32 values
  match PHP's serialize() output exactly for 23 algorithms

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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