feat(release): add plugin packaging script and release notes

docs/RELEASE.md

@@ -0,0 +1,27 @@
+# Release / Packaging
+
+## Package plugin files
+
+```bash
+node scripts/package-plugin.mjs
+```
+
+Output:
+
+- `dist/plugin/index.ts`
+- `dist/plugin/rules.ts`
+- `dist/plugin/openclaw.plugin.json`
+- `dist/plugin/README.md`
+- `dist/plugin/package.json`
+
+## Use packaged plugin path
+
+Point OpenClaw `plugins.load.paths` to:
+
+`/absolute/path/to/WhisperGate/dist/plugin`
+
+## Verify package completeness
+
+```bash
+cd plugin && npm run check
+```