synology: live-verify against cascadesDS, fix services method + pipe handling

First live exercise of the skill against the Cascades DS718+ (DSM 7.2.1, VPN up).
- Fix `services`: SYNO.Core.Service.list 103s on DSM 7.2.1 -> method is `get`.
- Fix `apis | head` BrokenPipeError traceback -> caught, clean exit.
- SKILL.md status PLUMBED -> VERIFIED 2026-06-25 with live device facts.
- wiki/cascades-tucson: add NAS specs, resolve model/RAM/DSM TODO.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.claude/skills/synology/scripts/syno_client.py

@@ -332,7 +332,8 @@ def main(argv):
         elif args.cmd == "packages":
             _print(c.call("SYNO.Core.Package", "list", additional='["status","installed_info"]'))
         elif args.cmd == "services":
-            _print(c.call("SYNO.Core.Service", "list"))
+            # DSM 7.2.x: SYNO.Core.Service enumerates via `get` (not `list`); returns {"service":[...]}
+            _print(c.call("SYNO.Core.Service", "get"))
         elif args.cmd == "connections":
             _print(c.call("SYNO.Core.CurrentConnection", "list"))
         elif args.cmd == "ls":
@@ -375,4 +376,12 @@ def main(argv):
 
 
 if __name__ == "__main__":
-    sys.exit(main(sys.argv[1:]))
+    try:
+        sys.exit(main(sys.argv[1:]))
+    except BrokenPipeError:
+        # downstream pipe closed (e.g. `apis | head`) -- exit cleanly, no traceback
+        try:
+            sys.stdout.close()
+        except Exception:
+            pass
+        os._exit(0)