fix(FN-3794): pass unload context and isolate WhatsApp sessions per project

- Extend PluginOnUnload to receive runtime context and wire ctx through plugin-loader unload hooks
- Scope WhatsApp chat plugin connections by project root to avoid cross-project session leakage
- Update plugin authoring docs and add a patch changeset for @runfusion/fusion
- Align plugin test suites across WhatsApp and example/runtime plugins with the new onUnload context contract

Fusion-Task-Id: FN-3794

plugins/fusion-plugin-reports/package.json

@@ -12,7 +12,7 @@
   },
   "scripts": {
     "build": "tsc",
-    "test": "vitest run --silent=passed-only --reporter=dot"
+    "test": "pnpm dlx vitest run --silent=passed-only --reporter=dot"
   },
   "dependencies": {
     "@fusion/core": "workspace:*",