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Add internal/crypto/crypto.go with byte-identical AES-256-CBC encryption
and decryption matching the Ruby OpenSSL reference in geheim.rb, including
key doubling (enforceKeyLength), IV derivation (buildIV), PKCS7 pad/unpad,
and NewCipher/Encrypt/Decrypt. Add internal/crypto/crypto_test.go with
table-driven golden tests (6 vectors from Ruby), roundtrip tests (8 cases),
enforceKeyLength/buildIV/PKCS7 unit tests, and error-path coverage (22 total).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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