fix(line): synthesize media/auth/routing webhook regressions (openclaw#32546) thanks @Takhoffman

Verified:
- pnpm build
- pnpm check
- pnpm test:macmini

Co-authored-by: Takhoffman <781889+Takhoffman@users.noreply.github.com>
Co-authored-by: Tak Hoffman <781889+Takhoffman@users.noreply.github.com>

src/line/webhook-node.test.ts

@@ -69,6 +69,23 @@ describe("createLineNodeWebhookHandler", () => {
     expect(res.body).toBe("OK");
   });
 
+  it("returns 204 for HEAD", async () => {
+    const bot = { handleWebhook: vi.fn(async () => {}) };
+    const runtime = { log: vi.fn(), error: vi.fn(), exit: vi.fn() };
+    const handler = createLineNodeWebhookHandler({
+      channelSecret: "secret",
+      bot,
+      runtime,
+      readBody: async () => "",
+    });
+
+    const { res } = createRes();
+    await handler({ method: "HEAD", headers: {} } as unknown as IncomingMessage, res);
+
+    expect(res.statusCode).toBe(204);
+    expect(res.body).toBeUndefined();
+  });
+
   it("returns 200 for verification request (empty events, no signature)", async () => {
     const rawBody = JSON.stringify({ events: [] });
     const { bot, handler } = createPostWebhookTestHarness(rawBody);
@@ -82,14 +99,14 @@ describe("createLineNodeWebhookHandler", () => {
     expect(bot.handleWebhook).not.toHaveBeenCalled();
   });
 
-  it("returns 405 for non-GET/non-POST methods", async () => {
+  it("returns 405 for non-GET/HEAD/POST methods", async () => {
     const { bot, handler } = createPostWebhookTestHarness(JSON.stringify({ events: [] }));
 
     const { res, headers } = createRes();
     await handler({ method: "PUT", headers: {} } as unknown as IncomingMessage, res);
 
     expect(res.statusCode).toBe(405);
-    expect(headers.allow).toBe("GET, POST");
+    expect(headers.allow).toBe("GET, HEAD, POST");
     expect(bot.handleWebhook).not.toHaveBeenCalled();
   });
 
@@ -178,6 +195,32 @@ describe("createLineNodeWebhookHandler", () => {
     );
   });
 
+  it("returns 200 immediately and logs when event processing fails", async () => {
+    const rawBody = JSON.stringify({ events: [{ type: "message" }] });
+    const { secret } = createPostWebhookTestHarness(rawBody);
+    const failingBot = {
+      handleWebhook: vi.fn(async () => {
+        throw new Error("transient failure");
+      }),
+    };
+    const runtime = { log: vi.fn(), error: vi.fn(), exit: vi.fn() };
+    const failingHandler = createLineNodeWebhookHandler({
+      channelSecret: secret,
+      bot: failingBot,
+      runtime,
+      readBody: async () => rawBody,
+    });
+
+    const { res } = createRes();
+    await runSignedPost({ handler: failingHandler, rawBody, secret, res });
+    await Promise.resolve();
+
+    expect(res.statusCode).toBe(200);
+    expect(res.body).toBe(JSON.stringify({ status: "ok" }));
+    expect(failingBot.handleWebhook).toHaveBeenCalledTimes(1);
+    expect(runtime.error).toHaveBeenCalledTimes(1);
+  });
+
   it("returns 400 for invalid JSON payload even when signature is valid", async () => {
     const rawBody = "not json";
     const { bot, handler, secret } = createPostWebhookTestHarness(rawBody);