fix(telemetry): align Tempo search tags with C++ span attribute names

RPC span attributes use bare names (command, rpc_status, rpc_role) per
the naming convention in SpanNames.h, not xrpl.rpc.* qualified names.
Node health attributes (amendment_blocked, server_state) are resource
attributes set at Tracer init, not span attributes.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docker/telemetry/grafana/provisioning/datasources/tempo.yaml

@@ -92,28 +92,28 @@ datasources:
             type: static
           # Phase 2: RPC tracing filters
           - id: rpc-command
-            tag: xrpl.rpc.command
+            tag: command
             operator: "="
             scope: span
             type: static
           - id: rpc-status
-            tag: xrpl.rpc.status
+            tag: rpc_status
             operator: "="
             scope: span
             type: dynamic
           - id: rpc-role
-            tag: xrpl.rpc.role
+            tag: rpc_role
             operator: "="
             scope: span
             type: dynamic
-          # Phase 2: Node health filters (Task 2.8)
+          # Phase 2: Node health filters (Task 2.8) — resource attributes
           - id: node-amendment-blocked
             tag: xrpl.node.amendment_blocked
             operator: "="
-            scope: span
+            scope: resource
             type: static
           - id: node-server-state
             tag: xrpl.node.server_state
             operator: "="
-            scope: span
+            scope: resource
             type: dynamic