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

src/skills/installer.test.ts

@@ -62,8 +62,11 @@ describe('SkillInstaller', () => {
     const skill = installer.install(sourceDir);
 
     expect(skill).not.toBeNull();
-    expect(skill!.manifest.name).toBe('my-skill');
-    expect(skill!.instructions).toBe('# My Skill\nDo the thing.');
+    if (!skill) {
+      throw new Error('Expected installed skill');
+    }
+    expect(skill.manifest.name).toBe('my-skill');
+    expect(skill.instructions).toBe('# My Skill\nDo the thing.');
     expect(existsSync(join(managedDir, 'my-skill', 'SKILL.md'))).toBe(true);
   });
 
@@ -79,7 +82,10 @@ describe('SkillInstaller', () => {
     const skill = installer.install(sourceDir);
 
     expect(skill).not.toBeNull();
-    expect(skill!.manifest.tier).toBe('managed');
+    if (!skill) {
+      throw new Error('Expected installed skill');
+    }
+    expect(skill.manifest.tier).toBe('managed');
   });
 
   it('uses manifest.json name field for the installed directory name', () => {
@@ -131,8 +137,11 @@ describe('SkillInstaller', () => {
     const skill = installer.install(sourceV2);
 
     expect(skill).not.toBeNull();
-    expect(skill!.manifest.version).toBe('2.0.0');
-    expect(skill!.instructions).toBe('# V2');
+    if (!skill) {
+      throw new Error('Expected installed skill');
+    }
+    expect(skill.manifest.version).toBe('2.0.0');
+    expect(skill.instructions).toBe('# V2');
   });
 
   it('throws when source directory does not exist', () => {