fix: fix configurations

tests/optchat.test.ts

@@ -437,3 +437,26 @@ test("checkpoints are not logged, provider-executed calls end a turn, and empty
         "user: next",
     ]);
 });
+
+test.each([{}, { compactionModel: "", dataDir: "" }])(
+    "without compactionModel (%j), optchat registers nothing",
+    async (options) => {
+        const registered: string[] = [];
+        const record = (name: string) => async () => {
+            registered.push(name);
+            return { dispose: async () => {} };
+        };
+        const context = {
+            options,
+            tool: { transform: record("tool") },
+            command: { transform: record("command") },
+            session: { hook: record("hook") },
+        };
+        // SAFETY: setup must return before touching any host service; a call is recorded and fails the test.
+        const setup = optchat.setup as (
+            context: Pick<Plugin.Context, "options">,
+        ) => ReturnType<typeof optchat.setup>;
+        expect(await setup(context)).toBeUndefined();
+        expect(registered).toEqual([]);
+    },
+);