{
  "utc": "2026-09-30T20:26:15.712416+00:00",
  "reason": "Data source formatting completed after first source lock; rejected attempts retained; AST equality verified; rerun all four preflights in new phase directory",
  "ast_identical": true,
  "previous_success": "results/grok-usage-v1/preflight/preflight-A"
}