chore(plugin): add package metadata and plugin file checker

plugin/package.json

@@ -0,0 +1,10 @@
+{
+  "name": "whispergate-plugin",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "description": "WhisperGate OpenClaw plugin",
+  "scripts": {
+    "check": "node ../scripts/check-plugin-files.mjs"
+  }
+}

scripts/check-plugin-files.mjs

@@ -0,0 +1,29 @@
+import fs from 'node:fs';
+import path from 'node:path';
+
+const root = path.resolve(process.cwd(), '..');
+const pluginDir = path.join(root, 'plugin');
+const required = ['index.ts', 'rules.ts', 'openclaw.plugin.json', 'README.md', 'package.json'];
+
+let ok = true;
+for (const f of required) {
+  const p = path.join(pluginDir, f);
+  if (!fs.existsSync(p)) {
+    ok = false;
+    console.error(`missing: ${p}`);
+  }
+}
+
+const manifestPath = path.join(pluginDir, 'openclaw.plugin.json');
+if (fs.existsSync(manifestPath)) {
+  const m = JSON.parse(fs.readFileSync(manifestPath, 'utf8'));
+  for (const k of ['id', 'entry', 'configSchema']) {
+    if (!(k in m)) {
+      ok = false;
+      console.error(`manifest missing key: ${k}`);
+    }
+  }
+}
+
+if (!ok) process.exit(1);
+console.log('plugin file check: ok');