Implement crash-safe streaming worker runtime

docs/api/openapi.yaml

@@ -472,6 +472,86 @@ paths:
           $ref: '#/components/responses/PreconditionFailed'
         default:
           $ref: '#/components/responses/Error'
+  /internal/v1/attempts/{attempt_id}/stop:
+    parameters:
+      - $ref: '#/components/parameters/AttemptId'
+    post:
+      operationId: stopAttempt
+      security:
+        - serviceAuth: []
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/AttemptStopRequest'
+      responses:
+        '204':
+          description: The exact attempt has cooperatively stopped, or no further stop action is required.
+        '409':
+          $ref: '#/components/responses/PreconditionFailed'
+        default:
+          $ref: '#/components/responses/Error'
+  /internal/v1/attempts/{attempt_id}/staging/write-intent:
+    parameters:
+      - $ref: '#/components/parameters/AttemptId'
+    post:
+      operationId: registerAttemptStagingWriteIntent
+      security:
+        - serviceAuth: []
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/AttemptStagingWriteIntentRequest'
+      responses:
+        '204':
+          description: Exact staging key intent durably registered before target I/O.
+        '409':
+          $ref: '#/components/responses/PreconditionFailed'
+        default:
+          $ref: '#/components/responses/Error'
+  /internal/v1/attempts/{attempt_id}/staging/object:
+    parameters:
+      - $ref: '#/components/parameters/AttemptId'
+    post:
+      operationId: registerAttemptStagingObject
+      security:
+        - serviceAuth: []
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/AttemptStagingObjectRequest'
+      responses:
+        '204':
+          description: Exact completed staging object identity durably registered.
+        '409':
+          $ref: '#/components/responses/PreconditionFailed'
+        default:
+          $ref: '#/components/responses/Error'
+  /internal/v1/attempts/{attempt_id}/staging/multipart:
+    parameters:
+      - $ref: '#/components/parameters/AttemptId'
+    post:
+      operationId: registerAttemptStagingMultipart
+      security:
+        - serviceAuth: []
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/AttemptStagingMultipartRequest'
+      responses:
+        '204':
+          description: Exact staging multipart identity durably registered.
+        '409':
+          $ref: '#/components/responses/PreconditionFailed'
+        default:
+          $ref: '#/components/responses/Error'
   /internal/v1/attempts/{attempt_id}/resolved-source:
     parameters:
       - $ref: '#/components/parameters/AttemptId'
@@ -1653,6 +1733,88 @@ components:
       unevaluatedProperties: false
       allOf:
         - $ref: '#/components/schemas/AttemptMutation'
+    AttemptStopRequest:
+      unevaluatedProperties: false
+      allOf:
+        - $ref: '#/components/schemas/AttemptMutation'
+    StagingObjectIdentity:
+      type: object
+      additionalProperties: false
+      required: [store, bucket, key]
+      properties:
+        store:
+          type: string
+          minLength: 1
+        bucket:
+          type: string
+          minLength: 1
+        key:
+          type: string
+          minLength: 1
+        version_id:
+          type: string
+          minLength: 1
+    StagingWriteIntent:
+      type: object
+      additionalProperties: false
+      required: [store, bucket, key]
+      properties:
+        store:
+          type: string
+          minLength: 1
+        bucket:
+          type: string
+          minLength: 1
+        key:
+          type: string
+          minLength: 1
+    StagingMultipartIdentity:
+      type: object
+      additionalProperties: false
+      required: [store, bucket, key, upload_id]
+      properties:
+        store:
+          type: string
+          minLength: 1
+        bucket:
+          type: string
+          minLength: 1
+        key:
+          type: string
+          minLength: 1
+        upload_id:
+          type: string
+          minLength: 1
+    AttemptStagingObjectRequest:
+      unevaluatedProperties: false
+      allOf:
+        - $ref: '#/components/schemas/AttemptMutation'
+        - type: object
+          required: [object]
+          properties:
+            object:
+              $ref: '#/components/schemas/StagingObjectIdentity'
+            completed_upload_id:
+              type: string
+              minLength: 1
+    AttemptStagingWriteIntentRequest:
+      unevaluatedProperties: false
+      allOf:
+        - $ref: '#/components/schemas/AttemptMutation'
+        - type: object
+          required: [intent]
+          properties:
+            intent:
+              $ref: '#/components/schemas/StagingWriteIntent'
+    AttemptStagingMultipartRequest:
+      unevaluatedProperties: false
+      allOf:
+        - $ref: '#/components/schemas/AttemptMutation'
+        - type: object
+          required: [multipart]
+          properties:
+            multipart:
+              $ref: '#/components/schemas/StagingMultipartIdentity'
     AttemptResolvedSourceRequest:
       unevaluatedProperties: false
       allOf:
@@ -1689,6 +1851,8 @@ components:
             validated_members:
               type: integer
               minimum: 0
+            staging_multipart:
+              $ref: '#/components/schemas/StagingMultipartIdentity'
     AttemptProgressRequest:
       unevaluatedProperties: false
       allOf: