feat(coding-agent): replace model registry with model runtime

Move provider auth and OAuth flows onto pi-ai Models, compose models.json and extension overlays through ModelRuntime, and retain ModelRegistry as an extension compatibility facade.

packages/coding-agent/test/interactive-mode-anthropic-warning.test.ts

@@ -7,19 +7,20 @@ function createSettingsManager(warnings: { anthropicExtraUsage?: boolean } = {})
 	};
 }
 
+function createModelRuntime(credential: { type: "oauth" } | undefined, apiKey?: string) {
+	return {
+		checkAuth: vi.fn().mockResolvedValue(credential),
+		getAuth: vi.fn().mockResolvedValue(apiKey ? { auth: { apiKey } } : undefined),
+	};
+}
+
 describe("InteractiveMode.maybeWarnAboutAnthropicSubscriptionAuth", () => {
 	test("warns once when Anthropic subscription auth is detected", async () => {
+		const modelRuntime = createModelRuntime(undefined, "sk-ant-oat01-test");
 		const fakeThis: any = {
 			anthropicSubscriptionWarningShown: false,
 			settingsManager: createSettingsManager(),
-			session: {
-				modelRegistry: {
-					authStorage: {
-						get: vi.fn().mockReturnValue(undefined),
-					},
-					getApiKeyForProvider: vi.fn().mockResolvedValue("sk-ant-oat01-test"),
-				},
-			},
+			session: { modelRuntime },
 			showWarning: vi.fn(),
 		};
 
@@ -31,21 +32,15 @@ describe("InteractiveMode.maybeWarnAboutAnthropicSubscriptionAuth", () => {
 		});
 
 		expect(fakeThis.showWarning).toHaveBeenCalledTimes(1);
-		expect(fakeThis.session.modelRegistry.getApiKeyForProvider).toHaveBeenCalledTimes(1);
+		expect(modelRuntime.getAuth).toHaveBeenCalledTimes(1);
 	});
 
 	test("warns when Anthropic OAuth is stored even if token refresh lookup would fail", async () => {
+		const modelRuntime = createModelRuntime({ type: "oauth" });
 		const fakeThis: any = {
 			anthropicSubscriptionWarningShown: false,
 			settingsManager: createSettingsManager(),
-			session: {
-				modelRegistry: {
-					authStorage: {
-						get: vi.fn().mockReturnValue({ type: "oauth" }),
-					},
-					getApiKeyForProvider: vi.fn().mockResolvedValue(undefined),
-				},
-			},
+			session: { modelRuntime },
 			showWarning: vi.fn(),
 		};
 
@@ -54,21 +49,15 @@ describe("InteractiveMode.maybeWarnAboutAnthropicSubscriptionAuth", () => {
 		});
 
 		expect(fakeThis.showWarning).toHaveBeenCalledTimes(1);
-		expect(fakeThis.session.modelRegistry.getApiKeyForProvider).not.toHaveBeenCalled();
+		expect(modelRuntime.getAuth).not.toHaveBeenCalled();
 	});
 
 	test("does not warn for non-Anthropic models", async () => {
+		const modelRuntime = createModelRuntime(undefined);
 		const fakeThis: any = {
 			anthropicSubscriptionWarningShown: false,
 			settingsManager: createSettingsManager(),
-			session: {
-				modelRegistry: {
-					authStorage: {
-						get: vi.fn(),
-					},
-					getApiKeyForProvider: vi.fn(),
-				},
-			},
+			session: { modelRuntime },
 			showWarning: vi.fn(),
 		};
 
@@ -77,21 +66,15 @@ describe("InteractiveMode.maybeWarnAboutAnthropicSubscriptionAuth", () => {
 		});
 
 		expect(fakeThis.showWarning).not.toHaveBeenCalled();
-		expect(fakeThis.session.modelRegistry.getApiKeyForProvider).not.toHaveBeenCalled();
+		expect(modelRuntime.getAuth).not.toHaveBeenCalled();
 	});
 
 	test("does not warn when Anthropic extra usage warning is disabled", async () => {
+		const modelRuntime = createModelRuntime(undefined);
 		const fakeThis: any = {
 			anthropicSubscriptionWarningShown: false,
 			settingsManager: createSettingsManager({ anthropicExtraUsage: false }),
-			session: {
-				modelRegistry: {
-					authStorage: {
-						get: vi.fn(),
-					},
-					getApiKeyForProvider: vi.fn(),
-				},
-			},
+			session: { modelRuntime },
 			showWarning: vi.fn(),
 		};
 
@@ -100,7 +83,7 @@ describe("InteractiveMode.maybeWarnAboutAnthropicSubscriptionAuth", () => {
 		});
 
 		expect(fakeThis.showWarning).not.toHaveBeenCalled();
-		expect(fakeThis.session.modelRegistry.authStorage.get).not.toHaveBeenCalled();
-		expect(fakeThis.session.modelRegistry.getApiKeyForProvider).not.toHaveBeenCalled();
+		expect(modelRuntime.checkAuth).not.toHaveBeenCalled();
+		expect(modelRuntime.getAuth).not.toHaveBeenCalled();
 	});
 });