feat(adapters): external adapter plugin system with dynamic UI parser

- Plugin loader: install/reload/remove/reinstall external adapters
  from npm packages or local directories
- Plugin store persisted at ~/.paperclip/adapter-plugins.json
- Self-healing UI parser resolution with version caching
- UI: Adapter Manager page, dynamic loader, display registry
  with humanized names for unknown adapter types
- Dev watch: exclude adapter-plugins dir from tsx watcher
  to prevent mid-request server restarts during reinstall
- All consumer fallbacks use getAdapterLabel() for consistent display
- AdapterTypeDropdown uses controlled open state for proper close behavior
- Remove hermes-local from built-in UI (externalized to plugin)
- Add docs for external adapters and UI parser contract

server/package.json

@@ -66,7 +66,6 @@
     "drizzle-orm": "^0.38.4",
     "embedded-postgres": "^18.1.0-beta.16",
     "express": "^5.1.0",
-    "hermes-paperclip-adapter": "^0.2.0",
     "jsdom": "^28.1.0",
     "multer": "^2.0.2",
     "open": "^11.0.0",
@@ -93,4 +92,4 @@
     "vite": "^6.1.0",
     "vitest": "^3.0.5"
   }
-}
+}