wren node: Train in the panel, as a run of wren's training flow

POST/GET /flows/{name}/nodes/{id}/train submit wren_train on the node's
targets, examples and tests and read its latest run (run.for_node,
cause "train"); "Use this model" writes `model` into the draft.

frontend/src/client/schemas.gen.ts

@@ -4505,6 +4505,61 @@ export const TokenRequestSchema = {
     title: 'TokenRequest'
 } as const;
 
+export const TrainingSchema = {
+    properties: {
+        id: {
+            type: 'string',
+            title: 'Id'
+        },
+        status: {
+            type: 'string',
+            title: 'Status'
+        },
+        error: {
+            type: 'string',
+            title: 'Error',
+            default: ''
+        },
+        result: {
+            additionalProperties: true,
+            type: 'object',
+            title: 'Result',
+            default: {}
+        },
+        model: {
+            type: 'string',
+            title: 'Model',
+            default: ''
+        },
+        threshold: {
+            anyOf: [
+                {
+                    type: 'number'
+                },
+                {
+                    type: 'null'
+                }
+            ],
+            title: 'Threshold'
+        },
+        test_exact_match: {
+            anyOf: [
+                {
+                    type: 'number'
+                },
+                {
+                    type: 'null'
+                }
+            ],
+            title: 'Test Exact Match'
+        }
+    },
+    type: 'object',
+    required: ['id', 'status'],
+    title: 'Training',
+    description: "A wren node's latest training run, as its panel shows it."
+} as const;
+
 export const TriggerRequestSchema = {
     properties: {
         values: {

frontend/src/client/types.gen.ts

@@ -1471,6 +1471,21 @@ export type TokenRequest = {
     labels?: Array<(string)>;
 };
 
+/**
+ * A wren node's latest training run, as its panel shows it.
+ */
+export type Training = {
+    id: string;
+    status: string;
+    error?: string;
+    result?: {
+        [key: string]: unknown;
+    };
+    model?: string;
+    threshold?: (number | null);
+    test_exact_match?: (number | null);
+};
+
 export type TriggerRequest = {
     values?: {
         [key: string]: unknown;
@@ -2112,6 +2127,20 @@ export type FlowsAcknowledgeNodeErrorData = {
 
 export type FlowsAcknowledgeNodeErrorResponse = (Message);
 
+export type FlowsTrainNodeData = {
+    name: string;
+    nodeId: string;
+};
+
+export type FlowsTrainNodeResponse = (Training);
+
+export type FlowsReadTrainingData = {
+    name: string;
+    nodeId: string;
+};
+
+export type FlowsReadTrainingResponse = ((Training | null));
+
 export type FlowsReadFlowStateData = {
     name: string;
 };