{
	"$schema": "https://json-schema.org/draft/2020-12/schema",
	"$id": "https://ultimate-pi.local/.pi/harness/specs/plan-packet.schema.json",
	"title": "PlanPacket",
	"description": "Plan-gated mutation contract emitted before execution (instance files: plan-packet.yaml).",
	"type": "object",
	"additionalProperties": false,
	"required": [
		"schema_version",
		"contract_version",
		"plan_id",
		"task_id",
		"scope",
		"assumptions",
		"risk_level",
		"acceptance_checks",
		"rollback_plan",
		"execution_plan"
	],
	"properties": {
		"schema_version": {
			"type": "string",
			"const": "1.0.0"
		},
		"contract_version": {
			"type": "string",
			"enum": ["1.0.0", "1.1.0"]
		},
		"plan_id": {
			"type": "string",
			"minLength": 1
		},
		"task_id": {
			"type": "string",
			"minLength": 1
		},
		"scope": {
			"type": "string",
			"minLength": 1
		},
		"assumptions": {
			"type": "array",
			"items": {
				"type": "string",
				"minLength": 1
			}
		},
		"risk_level": {
			"type": "string",
			"enum": ["low", "med", "high"]
		},
		"acceptance_checks": {
			"type": "array",
			"minItems": 1,
			"items": {
				"type": "object",
				"additionalProperties": false,
				"required": ["id", "description"],
				"properties": {
					"id": { "type": "string", "pattern": "^AC-[0-9]+$" },
					"description": { "type": "string", "minLength": 1 }
				}
			}
		},
		"rollback_plan": {
			"type": "object",
			"additionalProperties": false,
			"required": ["rollback_artifacts", "revert_commit_ready"],
			"properties": {
				"revert_commit_ready": {
					"type": "boolean",
					"const": true
				},
				"rollback_artifacts": {
					"type": "object",
					"additionalProperties": false,
					"required": ["revert_command", "revert_branch", "patch_bundle"],
					"properties": {
						"revert_command": {
							"type": "string",
							"minLength": 1
						},
						"revert_branch": {
							"type": "string",
							"minLength": 1
						},
						"patch_bundle": {
							"type": "string",
							"minLength": 1
						}
					}
				}
			}
		},
		"execution_plan": {
			"$ref": "plan-execution-plan.schema.json"
		},
		"executor_strategy": {
			"type": "string",
			"enum": ["single_pass", "per_lake", "per_work_item"]
		}
	}
}