fix(tracing): set trace back to running while announce span is active

When an announce (child trace) run starts, toggle the parent trace
status to "running" so the UI doesn't show "completed" with a running
child span. Restore to "completed" when the announce finishes.

internal/agent/loop_run.go

@@ -110,6 +110,13 @@ func (l *Loop) Run(ctx context.Context, req RunRequest) (*RunResult, error) {
 		l.emitAgentSpanStart(ctx, agentSpanID, runStart, req.Message)
 	}
 
+	// Child trace (announce run): set parent trace back to "running" while
+	// this run is active so the trace UI doesn't show "completed" with a
+	// "running" child span.
+	if isChildTrace && l.traceCollector != nil && traceID != uuid.Nil {
+		l.traceCollector.SetTraceStatus(ctx, traceID, store.TraceStatusRunning)
+	}
+
 	result, err := l.runLoop(ctx, req)
 
 	// Finalize the root agent span. Uses EmitSpanUpdate (channel send) so it
@@ -119,6 +126,15 @@ func (l *Loop) Run(ctx context.Context, req RunRequest) (*RunResult, error) {
 		l.emitAgentSpanEnd(ctx, agentSpanID, runStart, result, err)
 	}
 
+	// Child trace: restore trace status now that this run is done.
+	if isChildTrace && l.traceCollector != nil && traceID != uuid.Nil {
+		status := store.TraceStatusCompleted
+		if err != nil {
+			status = store.TraceStatusError
+		}
+		l.traceCollector.SetTraceStatus(ctx, traceID, status)
+	}
+
 	if err != nil {
 		emitRun(AgentEvent{
 			Type:    protocol.AgentEventRunFailed,

internal/tracing/collector.go

@@ -156,6 +156,16 @@ func (c *Collector) EmitSpanUpdate(spanID, traceID uuid.UUID, updates map[string
 	}
 }
 
+// SetTraceStatus updates only the trace status and marks it dirty for re-aggregation.
+// Used by child trace runs (e.g. announce) to toggle the parent trace back to
+// "running" while the child is active, then "completed" when done.
+func (c *Collector) SetTraceStatus(ctx context.Context, traceID uuid.UUID, status string) {
+	if err := c.store.UpdateTrace(ctx, traceID, map[string]any{"status": status}); err != nil {
+		slog.Warn("tracing: failed to set trace status", "trace_id", traceID, "error", err)
+	}
+	c.markDirty(traceID)
+}
+
 // FinishTrace marks a trace as completed and schedules aggregate update.
 func (c *Collector) FinishTrace(ctx context.Context, traceID uuid.UUID, status string, errMsg string, outputPreview string) {
 	now := time.Now().UTC()