feat: introduced aiand provider registry entry and model catalog

- Implement the ai& provider registry entry with API-key authentication and login support.
- Add model descriptors, static model seeding, and openai-compatible model discovery for the ai& provider.
- Update the model catalog with ai& provider models, pricing, and updated provider model names.
- Add unit tests for the ai& provider environment resolution, metadata, and dynamic model mapping.

packages/coding-agent/test/task/task-batch.test.ts

@@ -154,7 +154,7 @@ describe("task.batch schema gating", () => {
 		expect(batch.description).toContain("`effort`");
 	});
 
-	it("keeps isolation boolean-only and describes the configured apply behavior", async () => {
+	it("keeps isolation boolean-only in the batch item schema", async () => {
 		mockDiscovery();
 
 		const tool = await TaskTool.create(
@@ -169,18 +169,6 @@ describe("task.batch schema gating", () => {
 		}
 		expect(isolatedSchema.type).toBe("boolean");
 		expect(itemProperties.apply).toBeUndefined();
-		expect(tool.description).toContain("automatically applied to the parent checkout");
-
-		const captureTool = await TaskTool.create(
-			createSession({
-				settings: {
-					"task.batch": true,
-					"task.isolation.mode": "auto",
-					"task.isolation.apply": false,
-				},
-			}),
-		);
-		expect(captureTool.description).toContain("without modifying the parent checkout");
 	});
 
 	it("hides isolation from the dynamic batch schema in plan mode", async () => {