docs: clarify Raspberry Pi project names and integration scope

plugin/manifest.json

@@ -1,6 +1,6 @@
 {
   "id": "pigway-agent",
-  "name": "PIGWay Agent",
+  "name": "PIGWay Raspberry Pi Agent",
   "version": "1.0.0",
   "protocol_version": 1,
   "entrypoint": "worker.py",

plugin/worker.py

@@ -1,5 +1,5 @@
 #!/usr/bin/env python3
-"""Official Agent adapter. This process alone knows Agent endpoints/authentication."""
+"""Official Raspberry Pi adapter. This process alone knows Agent endpoints/authentication."""
 import concurrent.futures
 import json
 import sys