chore(lint): reduce warning debt across core adapters and model clients

src/models/router.test.ts

@@ -1,4 +1,4 @@
-import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { describe, it, expect, vi } from 'vitest';
 import { ModelRouter } from './router.js';
 import type { ModelClient, ChatResponse, ChatStreamEvent } from './types.js';
 
@@ -314,10 +314,13 @@ describe('setClient and labels', () => {
 
     const newFastClient = router.getClient('fast');
     expect(newFastClient).toBeDefined();
+    if (!newFastClient) {
+      throw new Error('Expected fast client to be set');
+    }
     await router.chat({ messages: [{ role: 'user', content: 'Test' }] }, 'fast');
 
-    expect(newFastClient!.chat).toHaveBeenCalled();
-    expect(newFastClient!.chat).toHaveBeenCalledTimes(1);
+    expect(newFastClient.chat).toHaveBeenCalled();
+    expect(newFastClient.chat).toHaveBeenCalledTimes(1);
     expect(mockClient1.chat).toHaveBeenCalledTimes(1);
   });
 
@@ -336,10 +339,13 @@ describe('setClient and labels', () => {
 
     const newClient = router.getClient('complex');
     expect(newClient).toBe(mockClient2);
+    if (!newClient) {
+      throw new Error('Expected complex client to be set');
+    }
 
     await router.chat({ messages: [{ role: 'user', content: 'Test' }] }, 'complex');
 
-    expect(newClient!.chat).toHaveBeenCalled();
+    expect(newClient.chat).toHaveBeenCalled();
   });
 
   it('getLabel returns the label set by setClient', () => {
@@ -424,19 +430,25 @@ describe('setClient and labels', () => {
 
     const initialFastClient = router.getClient('fast');
     expect(initialFastClient).toBeDefined();
+    if (!initialFastClient) {
+      throw new Error('Expected initial fast client to exist');
+    }
     await router.chat({ messages: [{ role: 'user', content: 'Test' }] }, 'fast');
 
-    expect(initialFastClient!.chat).toHaveBeenCalled();
-    expect(initialFastClient!.chat).toHaveBeenCalledTimes(1);
+    expect(initialFastClient.chat).toHaveBeenCalled();
+    expect(initialFastClient.chat).toHaveBeenCalledTimes(1);
 
     router.setClient('fast', mockClient2, 'fast-replaced');
 
     const newFastClient = router.getClient('fast');
+    if (!newFastClient) {
+      throw new Error('Expected replaced fast client to exist');
+    }
     await router.chat({ messages: [{ role: 'user', content: 'Test' }] }, 'fast');
 
-    expect(newFastClient!.chat).toHaveBeenCalled();
-    expect(newFastClient!.chat).toHaveBeenCalledTimes(1);
-    expect(initialFastClient!.chat).toHaveBeenCalledTimes(1);
+    expect(newFastClient.chat).toHaveBeenCalled();
+    expect(newFastClient.chat).toHaveBeenCalledTimes(1);
+    expect(initialFastClient.chat).toHaveBeenCalledTimes(1);
   });
 
   it('strict tier mode disables fallback chain for that tier', async () => {