fix(build): stop ignoring cmd/cyrene sources

The bare 'cyrene' .gitignore pattern matched the cmd/cyrene directory,
so trace_adapter.go was never committed and a fresh clone failed to
build (undefined: traceAdapter). Scope the pattern to the root binary
and add the missing file.

.gitignore

@@ -16,7 +16,7 @@ models.json
 *.dylib
 backend/cmd/*/main
 backend/cmd/*/cyrene
-cyrene
+/backend/cyrene
 
 # Go
 backend/vendor/

backend/cmd/cyrene/trace_adapter.go

@@ -0,0 +1,51 @@
+package main
+
+import (
+	"time"
+
+	tracepkg "git.yeij.top/AskaEth/Cyrene_v2/services/ai-core/trace"
+)
+
+// traceAdapter adapts trace.Logger to api.TraceLogger.
+type traceAdapter struct{ *tracepkg.Logger }
+
+func (a *traceAdapter) Recent(n int) []map[string]any {
+	traces := a.Logger.Recent(n)
+	result := make([]map[string]any, len(traces))
+	for i, t := range traces {
+		spans := make([]map[string]any, len(t.Spans))
+		for j, s := range t.Spans {
+			children := make([]map[string]any, len(s.Children))
+			for k, c := range s.Children {
+				children[k] = spanToMap(c)
+			}
+			spans[j] = spanToMap(s)
+			if len(children) > 0 { spans[j]["children"] = children }
+		}
+		result[i] = map[string]any{
+			"id":         t.ID,
+			"user_msg":   t.UserMsg,
+			"start_time": t.StartTime.Format(time.RFC3339Nano),
+			"end_time":   nil,
+			"status":     t.Status,
+			"error":      t.Error,
+			"spans":      spans,
+		}
+		if !t.EndTime.IsZero() {
+			result[i]["end_time"] = t.EndTime.Format(time.RFC3339Nano)
+		}
+	}
+	return result
+}
+
+func (a *traceAdapter) Clear() { a.Logger.Clear() }
+
+func spanToMap(s tracepkg.Span) map[string]any {
+	m := map[string]any{
+		"name": s.Name, "label": s.Label,
+		"start_ms": s.StartMs, "duration_ms": s.Duration,
+		"status": s.Status, "detail": s.Detail,
+	}
+	if s.Data != nil { m["data"] = s.Data }
+	return m
+}