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- internal/word.cr: fixed-width word arithmetic with an explicit width parameter. Width is an algorithm argument, not a type; operations use /, %, * and conditionals only (no new IR opcodes). - internal/bytes.cr: the single stdlib boundary for raw byte access. rawbuf.cr now delegates to it instead of naming load8/store8. - hash.cr: CRC-32/ISO-HDLC with configurable init and polynomial, SHA-256, HMAC-SHA256, HKDF-SHA256 and PBKDF2-HMAC-SHA256. Output lengths, iteration counts, seeds and polynomials are explicit. - test_hash.py checks every primitive against hashlib/hmac and a second CRC implementation. The SHA-256 K table is function-local because dynamic subscript on a global array currently reads zero (noted in the source; separate defect).
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概要
新增标准库内部字/字节层与公开哈希/KDF 面。
内部层（非 pub，用户不可见）
src/stdlib/internal/word.cr：任意宽度的 word 运算（wordAnd/Or/Xor/Not/Shl/Shr/Rotl/Rotr/Add/Sub/Mul）。宽度是算法参数（
bits: int），用/、%、*与条件实现，不新增 IR opcode、不引入宽度类型。src/stdlib/internal/bytes.cr：标准库唯一的 raw 字节边界。rawbuf.cr改为委托这里，不再直接命名
load8/store8。公开面（
hash.cr）crc32/crc32With(data, init, poly)/crc32Hex，以及增量
crc32Init/crc32Update/crc32Final。sha256/sha256Hex。hmacSha256/hmacSha256Hex。hkdfSha256/hkdfSha256Extract/hkdfSha256Expand/hkdfSha256Hex。pbkdf2Sha256/pbkdf2Sha256Hex。验证
selfhost-tests全绿（新增test_hash.py）bootstrap-tests全绿check全绿canary5/5，值不变test_hash.py用 Pythonhashlib/hmac+ 第二份 CRC 实现对拍，覆盖：CRC-32 空串/标准向量/自定义 init/CRC-32C 多项式/增量；
SHA-256 空串/abc/200B 跨块；
HMAC RFC 4231 case 1/2；
HKDF RFC 5869 test case 1（42B）与 64B 参数；
PBKDF2 c=1/2/8，输出 20/32 字节。
备注
sha256Compress的 K 常量表放在函数内：全局数组的动态下标目前读 0（既有后端缺陷，已在源码注释登记），本批不改该路径，避免把哈希实现建立在未验证的行为上。