feat(KB-060): add model selection to task creation

- Extend task creation types, store persistence, and API payloads to accept executor and validator model overrides
- Add inline model selection to the dashboard create card with default normalization, retryable model loading, and focus-safe interactions
- Wire the list-view create flow through InlineCreateCard and style the dropdown to stay usable within the viewport on mobile and desktop
- Add store, route, app, list-view, and inline-create tests covering override submission, partial selections, and inline creation behavior
- Document the new creation-time model selection flow and include a published package changeset

packages/core/src/store.test.ts

@@ -654,6 +654,30 @@ describe("TaskStore", () => {
     });
   });
 
+  describe("createTask — model overrides", () => {
+    it("persists executor and validator model overrides on creation", async () => {
+      const created = await store.createTask({
+        title: "Task with model overrides",
+        description: "Use explicit executor and validator models",
+        modelProvider: "anthropic",
+        modelId: "claude-sonnet-4-5",
+        validatorModelProvider: "openai",
+        validatorModelId: "gpt-4o",
+      });
+
+      expect(created.modelProvider).toBe("anthropic");
+      expect(created.modelId).toBe("claude-sonnet-4-5");
+      expect(created.validatorModelProvider).toBe("openai");
+      expect(created.validatorModelId).toBe("gpt-4o");
+
+      const persisted = await store.getTask(created.id);
+      expect(persisted.modelProvider).toBe("anthropic");
+      expect(persisted.modelId).toBe("claude-sonnet-4-5");
+      expect(persisted.validatorModelProvider).toBe("openai");
+      expect(persisted.validatorModelId).toBe("gpt-4o");
+    });
+  });
+
   describe("updateTask — model overrides", () => {
     it("sets executor model provider and id via updateTask", async () => {
       const task = await createTestTask();

packages/core/src/store.ts

@@ -194,6 +194,10 @@ export class TaskStore extends EventEmitter<TaskStoreEvents> {
       column: input.column || "triage",
       dependencies: input.dependencies || [],
       breakIntoSubtasks: input.breakIntoSubtasks === true ? true : undefined,
+      modelProvider: input.modelProvider,
+      modelId: input.modelId,
+      validatorModelProvider: input.validatorModelProvider,
+      validatorModelId: input.validatorModelId,
       steps: [],
       currentStep: 0,
       log: [{ timestamp: now, action: "Task created" }],

packages/core/src/types.ts

@@ -173,6 +173,22 @@ export interface TaskCreateInput {
   column?: Column;
   dependencies?: string[];
   breakIntoSubtasks?: boolean;
+  /** AI model provider override for the executor agent (e.g., "anthropic").
+   *  Must be set together with `modelId`. When both model fields are undefined,
+   *  the executor uses global settings defaults. */
+  modelProvider?: string;
+  /** AI model ID override for the executor agent (e.g., "claude-sonnet-4-5").
+   *  Must be set together with `modelProvider`. When both model fields are undefined,
+   *  the executor uses global settings defaults. */
+  modelId?: string;
+  /** AI model provider override for the validator/reviewer agent.
+   *  Must be set together with `validatorModelId`. When both validator model fields
+   *  are undefined, the reviewer uses global settings defaults. */
+  validatorModelProvider?: string;
+  /** AI model ID override for the validator/reviewer agent.
+   *  Must be set together with `validatorModelProvider`. When both validator model
+   *  fields are undefined, the reviewer uses global settings defaults. */
+  validatorModelId?: string;
 }
 
 export interface Settings {