fix: default low thinking for reasoning models

src/auto-reply/reply.directive.test.ts

@@ -700,4 +700,48 @@ describe("directive parsing", () => {
       expect(call?.model).toBe("gpt-4.1-mini");
     });
   });
+
+  it("defaults thinking to low for reasoning-capable models", async () => {
+    await withTempHome(async (home) => {
+      const storePath = path.join(home, "sessions.json");
+      vi.mocked(runEmbeddedPiAgent).mockResolvedValue({
+        payloads: [{ text: "done" }],
+        meta: {
+          durationMs: 5,
+          agentMeta: { sessionId: "s", provider: "p", model: "m" },
+        },
+      });
+      vi.mocked(loadModelCatalog).mockResolvedValueOnce([
+        {
+          id: "claude-opus-4-5",
+          name: "Opus 4.5",
+          provider: "anthropic",
+          reasoning: true,
+        },
+      ]);
+
+      await getReplyFromConfig(
+        {
+          Body: "hello",
+          From: "+1004",
+          To: "+2000",
+        },
+        {},
+        {
+          agent: {
+            model: "anthropic/claude-opus-4-5",
+            workspace: path.join(home, "clawd"),
+          },
+          whatsapp: {
+            allowFrom: ["*"],
+          },
+          session: { store: storePath },
+        },
+      );
+
+      expect(runEmbeddedPiAgent).toHaveBeenCalledOnce();
+      const call = vi.mocked(runEmbeddedPiAgent).mock.calls[0]?.[0];
+      expect(call?.thinkLevel).toBe("low");
+    });
+  });
 });