fix(telemetry): suppress unused span warning and regenerate levelization

- Add [[maybe_unused]] to the RAII span in processSession() — the
  variable is not read but its lifetime scopes the active OTel context
  for child spans created in processRequest()
- Regenerate levelization: remove premature xrpld.telemetry entries
  that reference a module not yet present on this branch

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.github/scripts/levelization/results/loops.txt

@@ -4,6 +4,9 @@ Loop: test.jtx test.toplevel
 Loop: test.jtx test.unit_test
   test.unit_test ~= test.jtx
 
+Loop: xrpl.telemetry xrpld.rpc
+  xrpld.rpc ~= xrpl.telemetry
+
 Loop: xrpld.app xrpld.overlay
   xrpld.app > xrpld.overlay
 

.github/scripts/levelization/results/ordering.txt

@@ -281,7 +281,6 @@ xrpld.perflog > xrpl.protocol
 xrpld.rpc > xrpl.basics
 xrpld.rpc > xrpl.core
 xrpld.rpc > xrpld.core
-xrpld.rpc > xrpld.telemetry
 xrpld.rpc > xrpl.json
 xrpld.rpc > xrpl.ledger
 xrpld.rpc > xrpl.net
@@ -296,4 +295,3 @@ xrpld.shamap > xrpl.basics
 xrpld.shamap > xrpld.core
 xrpld.shamap > xrpl.protocol
 xrpld.shamap > xrpl.shamap
-xrpld.telemetry > xrpl.telemetry