fix(lastleg): unblock inbound plan handoff

firstleg/src/main/resources/openapi/phase3-pda-convergence-v1.yaml

@@ -141,6 +141,7 @@ components:
         mergedIntoContainerBookingId: {type: integer, format: int64, nullable: true, description: Always null for the surviving ACTIVE operational container; populated only on hidden MERGED source history}
         taskStatus: {type: string, enum: [LOADING, COMPLETING, COMPLETION_FAILED, COMPLETED]}
         workflowStatus: {type: string, enum: [UNASSIGNED, IN_PROGRESS, AWAITING_REVIEW, PROCESSING, COMPLETION_FAILED, COMPLETED]}
+        completionCommand: {$ref: '#/components/schemas/CompletionCommand', nullable: true}
         version: {type: integer, minimum: 0}
         assignment: {type: object, nullable: true}
         review: {type: object, nullable: true}
@@ -236,6 +237,22 @@ components:
         expectedTaskVersion: {type: integer, minimum: 0}
         operationId: {type: string, maxLength: 128}
         remark: {type: string, maxLength: 500}
+    CompletionCommand:
+      type: object
+      required: [id, operationId, status, expectedTaskVersion, attemptCount]
+      properties:
+        id: {type: integer, format: int64}
+        operationId: {type: string, maxLength: 128, description: Retry must reuse this exact identity}
+        status: {type: string, enum: [PROCESSING, RETRYABLE, FAILED, COMPLETED]}
+        expectedTaskVersion: {type: integer, minimum: 0, description: Retry must preserve this request-hashed version}
+        remark: {type: string, maxLength: 500, nullable: true, description: Retry must preserve this request-hashed remark}
+        attemptCount: {type: integer, minimum: 0}
+        nextRetryAt: {type: string, format: date-time, nullable: true}
+        failureStage: {type: string, nullable: true}
+        failureCode: {type: string, nullable: true}
+        requestId: {type: string, nullable: true}
+        traceId: {type: string, nullable: true}
+        completedAt: {type: string, format: date-time, nullable: true}
     CompleteLoadingRequest:
       type: object
       required: [expectedTaskVersion, operationId]