{
  "$comment": "schema_version: 1; contract source: agents/llm2bedrock-code-rewriter.md §27, PLUS two fields this design adds for resume identity (design §5.1 rewriter exception): baseline_parent_sha, branch_tip_sha. notes carries test counts / collision detail per §27, so it is required. blocked reasons per rewriter §27 (shared enum: model_access, source_key_auth, model_unresolvable).",
  "oneOf": [
    {
      "type": "object",
      "additionalProperties": false,
      "required": [
        "branch_name",
        "files_changed",
        "dependencies_updated",
        "notes",
        "behavior_delta_decisions",
        "baseline_parent_sha",
        "branch_tip_sha"
      ],
      "properties": {
        "summary": { "type": "string" },
        "branch_name": { "type": "string" },
        "files_changed": { "type": "array", "items": { "type": "string" } },
        "dependencies_updated": { "type": "array", "items": { "type": "string" } },
        "notes": { "type": "string" },
        "behavior_delta_decisions": {
          "type": "array",
          "items": {
            "type": "object",
            "required": ["delta_type", "location", "resolution_chosen", "source"],
            "properties": {
              "delta_type": { "type": "string" },
              "location": { "type": "string" },
              "resolution_chosen": { "type": "string" },
              "source": { "type": "string" },
              "user_verbatim_answer": { "type": "string" }
            }
          }
        },
        "baseline_parent_sha": { "type": "string", "pattern": "^[0-9a-f]{40}$" },
        "branch_tip_sha": { "type": "string", "pattern": "^[0-9a-f]{40}$" }
      }
    },
    {
      "type": "object",
      "additionalProperties": false,
      "required": ["blocked"],
      "properties": {
        "blocked": {
          "type": "object",
          "additionalProperties": false,
          "required": ["reason", "detail"],
          "properties": {
            "reason": { "type": "string", "enum": ["model_access", "source_key_auth", "model_unresolvable"] },
            "detail": { "type": "string" }
          }
        }
      }
    }
  ]
}