fix(agent-chat): suivi replay distant + timeout 15s

- Session ID vide pour auto-détection de la session Agent V1 active
- Timeout augmenté de 5s à 15s pour la requête replay
- Ajout _poll_replay_progress : suit la progression réelle du replay
  (polling /replay/{id} toutes les 2s, max 120s) au lieu de marquer
  faussement "terminé avec succès" immédiatement

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

agent_chat/app.py

@@ -994,10 +994,10 @@ def _try_streaming_server_replay(workflow_id: str, params: Dict[str, Any]) -> Op
             f"{STREAMING_SERVER_URL}/api/v1/traces/stream/replay",
             json={
                 "workflow_id": workflow_id,
-                "session_id": f"chat_{datetime.now().strftime('%H%M%S')}",
+                "session_id": "",  # Vide = auto-détection de la session Agent V1 active
                 "params": params or {},
             },
-            timeout=5,
+            timeout=15,
         )
         if resp.status_code == 200:
             data = resp.json()
@@ -1018,6 +1018,64 @@ def _try_streaming_server_replay(workflow_id: str, params: Dict[str, Any]) -> Op
     return None
 
 
+def _poll_replay_progress(replay_id: str, workflow_name: str, total_actions: int):
+    """Suivre la progression d'un replay distant via polling."""
+    import time
+
+    max_wait = 120  # 2 minutes max
+    poll_interval = 2.0
+    elapsed = 0
+
+    while elapsed < max_wait and execution_status.get("running"):
+        time.sleep(poll_interval)
+        elapsed += poll_interval
+
+        try:
+            resp = http_requests.get(
+                f"{STREAMING_SERVER_URL}/api/v1/traces/stream/replay/{replay_id}",
+                timeout=3,
+            )
+            if not resp.ok:
+                continue
+
+            data = resp.json()
+            status = data.get("status", "unknown")
+            completed = data.get("completed_actions", 0)
+            failed = data.get("failed_actions", 0)
+            progress = int(10 + (completed / max(total_actions, 1)) * 80)
+
+            socketio.emit('execution_progress', {
+                "progress": progress,
+                "step": f"Action {completed}/{total_actions} exécutée",
+                "current": completed,
+                "total": total_actions,
+            })
+
+            if status == "completed":
+                finish_execution(
+                    workflow_name, failed == 0,
+                    f"Replay terminé : {completed} actions exécutées"
+                    + (f", {failed} échecs" if failed else "")
+                )
+                return
+            elif status == "failed":
+                finish_execution(
+                    workflow_name, False,
+                    f"Replay échoué : {completed}/{total_actions} actions, {failed} échecs"
+                )
+                return
+
+        except Exception as e:
+            logger.debug(f"Poll replay progress: {e}")
+
+    # Timeout
+    if execution_status.get("running"):
+        finish_execution(
+            workflow_name, False,
+            f"Timeout — replay toujours en cours après {max_wait}s"
+        )
+
+
 def execute_workflow(match, params):
     """
     Exécuter un workflow — tente d'abord le streaming server,
@@ -1031,22 +1089,31 @@ def execute_workflow(match, params):
     replay_result = _try_streaming_server_replay(match.workflow_id, params)
     if replay_result:
         # Le streaming server a accepté le replay
+        total_actions = replay_result.get("total_actions", 1)
+        target_session = replay_result.get("session_id", "?")
         execution_status["running"] = True
         execution_status["workflow"] = match.workflow_name
-        execution_status["progress"] = 50
-        execution_status["message"] = "Envoyé au streaming server (Agent V1)"
+        execution_status["progress"] = 10
+        execution_status["message"] = f"Envoyé à l'Agent V1 ({target_session})"
 
         socketio.emit('execution_progress', {
-            "progress": 50,
-            "step": "Exécution via streaming server...",
-            "current": 1,
-            "total": 1,
+            "progress": 10,
+            "step": f"Replay envoyé à l'Agent V1 — {total_actions} actions en attente",
+            "current": 0,
+            "total": total_actions,
         })
 
-        finish_execution(
-            match.workflow_name, True,
-            f"Workflow envoyé au streaming server ({replay_result.get('status', 'ok')})"
-        )
+        # Suivre la progression du replay (polling toutes les 2s, max 120s)
+        replay_id = replay_result.get("replay_id")
+        if replay_id:
+            socketio.start_background_task(
+                _poll_replay_progress, replay_id, match.workflow_name, total_actions
+            )
+        else:
+            finish_execution(
+                match.workflow_name, True,
+                f"Replay envoyé ({total_actions} actions)"
+            )
         return
 
     # Fallback : exécution locale