{
  "id": "001-basic",
  "category": "hmac-sha256",
  "description": "HMAC-SHA256 signature over the canonical input of a single-layer payload. Fixed ASCII key; reproducible output.",
  "spec_section": "LRFS v1.0 §4.1",
  "inputs": {
    "layers": {
      "llmind:text": "hello world"
    },
    "key_utf8": "LRFS-test-key-001-v1",
    "key_hex": "4c5246532d746573742d6b65792d3030312d7631"
  },
  "expected": {
    "canonical_bytes_hex": "6c6c6d696e643a746578740068656c6c6f20776f726c6400",
    "signature_base64": "/0gu5E01jiqjQGWTJhSPcfQfG+xssi3nSlO7K6UWPiY=",
    "llmind_signature_value": "hmac-sha256:/0gu5E01jiqjQGWTJhSPcfQfG+xssi3nSlO7K6UWPiY="
  }
}