{
  "id": "002-nist-abc",
  "category": "file-checksum",
  "description": "SHA-256 of the 3-byte ASCII string \"abc\". Standard NIST FIPS 180-4 test vector; any conformant SHA-256 implementation produces the expected hex digest.",
  "spec_section": "LRFS v1.0 §4.3",
  "inputs": {
    "file_bytes_hex": "616263",
    "file_bytes_utf8": "abc"
  },
  "expected": {
    "sha256_hex": "ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad"
  },
  "notes": "This vector is a sanity check for the SHA-256 implementation; not LRFS-specific. Expected digest per FIPS 180-4 Appendix B.1 is ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad."
}