Function applyFixesResultToJson

Convert an ApplyFixesResult to a plain JSON-serializable object — bucket counts, plus each outcome with its strategy label, fix-emitted trace string, and the originating issue.

Sample output:

{
  "generatedAt": "2026-04-30T12:35:01.123Z",
  "counts": {"fixed": 8, "skipped": 0, "errors": 0, "total": 8},
  "fixed": [
    {
      "issue":    {"severity": "warning", "code": "GEOMETRY_DUPLICATE", ...},
      "strategy": "Coalesce duplicate geometries",
      "trace":    "'geom-47' kept; merged 4 meshes, destroyed: geom-3, geom-12, geom-89"
    }
  ],
  "skipped": [],
  "errors":  []
}
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