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  "mode": "JS8",
  "tool": "webftr-js8-sync-probe",
  "tool_version": "step63-source-exact-interleaver-whitening-index-extract",
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  "rx_only": true,
  "safety": {
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    "ptt": false,
    "tune": false,
    "send": false,
    "js8call_runtime_control": false
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  ],
  "decodes": [],
  "warnings": [
    "No JS8 text decode is expected in Step 54. Final real LDPC/FEC and Varicode/message unpack are not implemented yet.",
    "Costas7 scoring is a lab candidate extractor; real decoder validation requires actual JS8 WAV samples."
  ],
  "next_action": "Run sync-probe on real JS8 WAV captures. If stable sync_candidates appear, Step 54 can continue soft-symbol metric extraction for the LDPC/FEC path."
}