feat(M2): Client Detection & Configuration

tools/ai-cli-dispatch/tests/config.test.ts

@@ -108,4 +108,31 @@ describe("resolveConfig", () => {
     });
     assert.strictEqual(config.defaultClient, "codex");
   });
+
+  it("ignores invalid defaultClient from file", () => {
+    const config = resolveConfig({
+      existsSync: () => true,
+      readFileSync: () => JSON.stringify({ defaultClient: "foo" }),
+      whichSync: () => undefined,
+    });
+    assert.strictEqual(config.defaultClient, undefined);
+  });
+
+  it("ignores invalid defaultClient from env var", () => {
+    const config = resolveConfig({
+      env: { AI_CLI_DEFAULT_CLIENT: "bar" },
+      existsSync: () => false,
+      whichSync: () => undefined,
+    });
+    assert.strictEqual(config.defaultClient, undefined);
+  });
+
+  it("ignores invalid defaultClient from flag", () => {
+    const config = resolveConfig({
+      flags: { "default-client": "baz" },
+      existsSync: () => false,
+      whichSync: () => undefined,
+    });
+    assert.strictEqual(config.defaultClient, undefined);
+  });
 });