Force JNI path for context writes in OTEL mode

On Java < 17, ThreadContext.put() uses the ByteBuffer path which writes
directly to the Context struct, bypassing ContextApi::set(). In OTEL
mode this means the OTEP record is never written. Fix: always use
setContext0 JNI when otelMode is active.

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

Author: jbachorik

ddprof-lib/src/main/java/com/datadoghq/profiler/ThreadContext.java

@@ -156,7 +156,9 @@ public long getChecksum() {
     }
 
     public long put(long spanId, long rootSpanId) {
-        return useJNI ? setContext0(spanId, rootSpanId) : putContextJava(spanId, rootSpanId);
+        // OTEL mode must always use JNI to route through ContextApi::set()
+        // which writes to the OTEP record (ByteBuffer path only writes to Context struct)
+        return (useJNI || otelMode) ? setContext0(spanId, rootSpanId) : putContextJava(spanId, rootSpanId);
     }
 
     public void putCustom(int offset, int value) {