feat: Add Line plugin (#1630)

* feat: add LINE plugin (#1630) (thanks @plum-dawg)

* feat: complete LINE plugin (#1630) (thanks @plum-dawg)

* chore: drop line plugin node_modules (#1630) (thanks @plum-dawg)

* test: mock /context report in commands test (#1630) (thanks @plum-dawg)

* test: limit macOS CI workers to avoid OOM (#1630) (thanks @plum-dawg)

* test: reduce macOS CI vitest workers (#1630) (thanks @plum-dawg)

---------

Co-authored-by: Peter Steinberger <steipete@gmail.com>

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

@@ -0,0 +1,22 @@
+import { describe, expect, it } from "vitest";
+
+import { normalizeReplyPayload } from "./normalize-reply.js";
+
+// Keep channelData-only payloads so channel-specific replies survive normalization.
+describe("normalizeReplyPayload", () => {
+  it("keeps channelData-only replies", () => {
+    const payload = {
+      channelData: {
+        line: {
+          flexMessage: { type: "bubble" },
+        },
+      },
+    };
+
+    const normalized = normalizeReplyPayload(payload);
+
+    expect(normalized).not.toBeNull();
+    expect(normalized?.text).toBeUndefined();
+    expect(normalized?.channelData).toEqual(payload.channelData);
+  });
+});