fix: address all 17 PR review comments

Resolves review threads:
- PRRT_kwDOO6Hdxs50fewG (setup.py): non-eliciting clients now return True
  from elicit_reset_confirmation so they can reconfigure without being blocked
- PRRT_kwDOO6Hdxs50fewM (test-tools.sh): add notification/recalculate smoke test
- PRRT_kwDOO6Hdxs50fewP (test-tools.sh): add system/array smoke test
- PRRT_kwDOO6Hdxs50fewT (resources.py): surface manager error state instead of
  reporting 'connecting' for permanently failed subscriptions
- PRRT_kwDOO6Hdxs50feAj (resources.py): use is not None check for empty cached dicts
- PRRT_kwDOO6Hdxs50fewY (integration tests): remove duplicate snapshot-registration
  tests already covered in test_resources.py
- PRRT_kwDOO6Hdxs50fewe (test_resources.py): replace brittle import-detail test
  with behavior tests for connecting/error states
- PRRT_kwDOO6Hdxs50fewh (test_customization.py): strengthen public_theme assertion
- PRRT_kwDOO6Hdxs50fewk (test_customization.py): strengthen theme assertion
- PRRT_kwDOO6Hdxs50fewo (__init__.py): correct subaction count ~88 -> ~107
- PRRT_kwDOO6Hdxs50fewx (test_oidc.py): assert providers list value directly
- PRRT_kwDOO6Hdxs50fewz (unraid.py): remove unreachable raise after vm handler
- PRRT_kwDOO6Hdxs50few2 (unraid.py): remove unreachable raise after docker handler
- PRRT_kwDOO6Hdxs50fev8 (CLAUDE.md): replace legacy 15-tool table with unified
  unraid action/subaction table
- PRRT_kwDOO6Hdxs50fev_ (test_oidc.py): assert providers + defaultAllowedOrigins
- PRRT_kwDOO6Hdxs50feAz (CLAUDE.md): update tool categories to unified API shape
- PRRT_kwDOO6Hdxs50feBE (CLAUDE.md/setup.py): update unraid_health refs to
  unraid(action=health, subaction=setup)

unraid_mcp/subscriptions/resources.py

@@ -107,8 +107,17 @@ def register_subscription_resources(mcp: FastMCP) -> None:
         async def _live_resource() -> str:
             await ensure_subscriptions_started()
             data = await subscription_manager.get_resource_data(action)
-            if data:
+            if data is not None:
                 return json.dumps(data, indent=2)
+            # Surface permanent errors instead of reporting "connecting" indefinitely
+            last_error = subscription_manager.last_error.get(action)
+            if last_error:
+                return json.dumps(
+                    {
+                        "status": "error",
+                        "message": f"Subscription '{action}' failed: {last_error}",
+                    }
+                )
             return json.dumps(
                 {
                     "status": "connecting",