feat: enable adaptive context pruning by default

src/config/config.test.ts

@@ -269,7 +269,7 @@ describe("config identity defaults", () => {
     });
   });
 
-  it("does not synthesize agent/session when absent", async () => {
+  it("does not synthesize session when absent", async () => {
     await withTempHome(async (home) => {
       const configDir = path.join(home, ".clawdbot");
       await fs.mkdir(configDir, { recursive: true });
@@ -295,7 +295,7 @@ describe("config identity defaults", () => {
       expect(cfg.routing?.groupChat?.mentionPatterns).toEqual([
         "\\b@?Samantha\\b",
       ]);
-      expect(cfg.agent).toBeUndefined();
+      expect(cfg.agent?.contextPruning?.mode).toBe("adaptive");
       expect(cfg.session).toBeUndefined();
     });
   });
@@ -327,6 +327,48 @@ describe("config identity defaults", () => {
   });
 });
 
+describe("config pruning defaults", () => {
+  it("defaults contextPruning mode to adaptive", async () => {
+    await withTempHome(async (home) => {
+      const configDir = path.join(home, ".clawdbot");
+      await fs.mkdir(configDir, { recursive: true });
+      await fs.writeFile(
+        path.join(configDir, "clawdbot.json"),
+        JSON.stringify({ agent: {} }, null, 2),
+        "utf-8",
+      );
+
+      vi.resetModules();
+      const { loadConfig } = await import("./config.js");
+      const cfg = loadConfig();
+
+      expect(cfg.agent?.contextPruning?.mode).toBe("adaptive");
+    });
+  });
+
+  it("does not override explicit contextPruning mode", async () => {
+    await withTempHome(async (home) => {
+      const configDir = path.join(home, ".clawdbot");
+      await fs.mkdir(configDir, { recursive: true });
+      await fs.writeFile(
+        path.join(configDir, "clawdbot.json"),
+        JSON.stringify(
+          { agent: { contextPruning: { mode: "off" } } },
+          null,
+          2,
+        ),
+        "utf-8",
+      );
+
+      vi.resetModules();
+      const { loadConfig } = await import("./config.js");
+      const cfg = loadConfig();
+
+      expect(cfg.agent?.contextPruning?.mode).toBe("off");
+    });
+  });
+});
+
 describe("config discord", () => {
   let previousHome: string | undefined;