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/commands.test.ts

@@ -10,11 +10,26 @@ import {
 } from "../../agents/subagent-registry.js";
 import type { ClawdbotConfig } from "../../config/config.js";
 import * as internalHooks from "../../hooks/internal-hooks.js";
+import { clearPluginCommands, registerPluginCommand } from "../../plugins/commands.js";
 import type { MsgContext } from "../templating.js";
 import { resetBashChatCommandForTests } from "./bash-command.js";
 import { buildCommandContext, handleCommands } from "./commands.js";
 import { parseInlineDirectives } from "./directive-handling.js";
 
+// Avoid expensive workspace scans during /context tests.
+vi.mock("./commands-context-report.js", () => ({
+  buildContextReply: async (params: { command: { commandBodyNormalized: string } }) => {
+    const normalized = params.command.commandBodyNormalized;
+    if (normalized === "/context list") {
+      return { text: "Injected workspace files:\n- AGENTS.md" };
+    }
+    if (normalized === "/context detail") {
+      return { text: "Context breakdown (detailed)\nTop tools (schema size):" };
+    }
+    return { text: "/context\n- /context list\nInline shortcut" };
+  },
+}));
+
 let testWorkspaceDir = os.tmpdir();
 
 beforeAll(async () => {
@@ -143,6 +158,29 @@ describe("handleCommands bash alias", () => {
   });
 });
 
+describe("handleCommands plugin commands", () => {
+  it("dispatches registered plugin commands", async () => {
+    clearPluginCommands();
+    const result = registerPluginCommand("test-plugin", {
+      name: "card",
+      description: "Test card",
+      handler: async () => ({ text: "from plugin" }),
+    });
+    expect(result.ok).toBe(true);
+
+    const cfg = {
+      commands: { text: true },
+      channels: { whatsapp: { allowFrom: ["*"] } },
+    } as ClawdbotConfig;
+    const params = buildParams("/card", cfg);
+    const commandResult = await handleCommands(params);
+
+    expect(commandResult.shouldContinue).toBe(false);
+    expect(commandResult.reply?.text).toBe("from plugin");
+    clearPluginCommands();
+  });
+});
+
 describe("handleCommands identity", () => {
   it("returns sender details for /whoami", async () => {
     const cfg = {