Phase 8: Fix CI — add missing OTel trace/context.h include and cspell logql

Add opentelemetry/trace/context.h to Log.cpp so that
opentelemetry::trace::GetSpan() resolves correctly.
Add 'logql' to cspell dictionary to silence unknown-word warnings.

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

cspell.config.yaml

@@ -143,6 +143,7 @@ words:
   - libxrpl
   - llection
   - LOCALGOOD
+  - logql
   - logwstream
   - lseq
   - lsmf

src/libxrpl/basics/Log.cpp

@@ -11,6 +11,7 @@
 // with no locking — measured at <10ns per call.
 #ifdef XRPL_ENABLE_TELEMETRY
 #include <opentelemetry/context/runtime_context.h>
+#include <opentelemetry/trace/context.h>
 #include <opentelemetry/trace/provider.h>
 #endif  // XRPL_ENABLE_TELEMETRY