Refactor UI modules and harden run/API behavior

tests/provider-executor.test.ts

@@ -1,6 +1,6 @@
 import test from "node:test";
 import assert from "node:assert/strict";
-import { parseActorExecutionResultFromModelOutput } from "../src/ui/provider-executor.js";
+import { parseActorExecutionResultFromModelOutput } from "../src/agents/provider-executor.js";
 
 test("parseActorExecutionResultFromModelOutput parses strict JSON payload", () => {
   const parsed = parseActorExecutionResultFromModelOutput({
@@ -64,3 +64,42 @@ test("parseActorExecutionResultFromModelOutput falls back when response is not J
   assert.equal(parsed.status, "success");
   assert.equal(parsed.payload?.assistantResponse, "Implemented update successfully.");
 });
+
+test("parseActorExecutionResultFromModelOutput preserves status when optional fields are malformed", () => {
+  const parsed = parseActorExecutionResultFromModelOutput({
+    rawText: JSON.stringify({
+      status: "failure",
+      payload: {
+        reason: "hard failure",
+      },
+      stateFlags: {
+        retryable: false,
+        invalid_flag: "nope",
+      },
+      stateMetadata: "not-an-object",
+      events: [
+        {
+          type: "validation_failed",
+          payload: {
+            summary: "failed",
+          },
+        },
+        {
+          type: 123,
+        },
+      ],
+      failureKind: "not-valid",
+      failureCode: 403,
+    }),
+  });
+
+  assert.equal(parsed.status, "failure");
+  assert.equal(parsed.payload?.reason, "hard failure");
+  assert.equal(parsed.stateFlags?.retryable, false);
+  assert.equal(parsed.stateFlags && "invalid_flag" in parsed.stateFlags, false);
+  assert.equal(parsed.stateMetadata, undefined);
+  assert.equal(parsed.events?.length, 1);
+  assert.equal(parsed.events?.[0]?.type, "validation_failed");
+  assert.equal(parsed.failureKind, undefined);
+  assert.equal(parsed.failureCode, undefined);
+});