feat(trace): waterfall visualization + persona YAML sync

- trace.Logger: Trace+Span model with 14+ hop tracking
- trace.SpanTimer: convenience API for instrumentation
- trace_adapter.go: serialize Trace+Span for frontend
- Frontend TracePage: colored waterfall bars, expand/collapse, detail popup
- persona.go: full v1 YAML parser (identity/traits/forbidden/sections)
- cyrene_persona.yaml: v1 persona config copied to v2
- Orchestrator: TraceHook + MemoryExtractor injection points

backend/cmd/cyrene/main.go

@@ -281,21 +281,6 @@ func pluginNamesToMap(names []string) []map[string]string {
 	return result
 }
 
-// traceAdapter adapts trace.Logger to api.TraceLogger interface.
-type traceAdapter struct{ *tracepkg.Logger }
-func (a *traceAdapter) Recent(n int) []map[string]any {
-	events := a.Logger.Recent(n)
-	result := make([]map[string]any, len(events))
-	for i, e := range events {
-		result[i] = map[string]any{
-			"id": e.ID, "timestamp": e.Timestamp.Format(time.RFC3339),
-			"hop": e.Hop, "label": e.Label, "status": e.Status,
-			"duration_ms": e.DurationMs, "detail": e.Detail, "data": e.Data,
-		}
-		if result[i]["data"] == nil { result[i]["data"] = map[string]any{} }
-	}
-	return result
-}
 
 // perfAdapter adapts perf.Monitor to api.PerfMonitor interface.
 type perfAdapter struct{ *perfpkg.Monitor }