fix(FN-3794): scope plugin unload and WhatsApp connections per project

- Scope WhatsApp chat plugin connection state by project root to avoid cross-project leakage
- Extend plugin onUnload context plumbing and align core/plugin tests with the new ctx contract
- Document plugin onUnload context usage and add FN-3794 changeset metadata
- Promote universal web fetch availability across triage/reviewer/merger paths with updated engine tests
- Add reports/roadmap plugin test and scaffold updates carried by the branch

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:*",