Enrich GCP wire logs with trace context from the request ctx

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

internal/provider/gcp/wirelog.go

@@ -6,6 +6,7 @@ import (
 	"log/slog"
 
 	"github.com/go-logr/logr"
+	"go.opentelemetry.io/otel/trace"
 )
 
 // wireLogMaxFieldBytes is the elision threshold for string fields in wire
@@ -47,6 +48,15 @@ func (h *wireFilterHandler) Handle(ctx context.Context, rec slog.Record) error {
 	if rec.Level <= slog.LevelDebug && rec.Message != "api request" && rec.Message != "api response" {
 		return nil
 	}
+	// The SDK logs with the request ctx, so wire records can carry the
+	// surrounding provider span — the one place slog's ctx-aware handlers
+	// beat logr, and the same keys the logr enrichment uses.
+	if sc := trace.SpanContextFromContext(ctx); sc.IsValid() {
+		rec = rec.Clone()
+		rec.AddAttrs(
+			slog.String("traceID", sc.TraceID().String()),
+			slog.String("spanID", sc.SpanID().String()))
+	}
 	if h.fullPayloads {
 		return h.inner.Handle(ctx, rec)
 	}