docs(ideai): met à jour sprints et tickets après le partage de programmes/séances

Ajoute un sprint, clôture le ticket #50, ajoute le cadrage du ticket #54.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.ideai/tickets/index.json

@@ -567,11 +567,11 @@
       "issueRef": "#50",
       "path": "50",
       "title": "[Server] API de synchronisation incrémentale LWW",
-      "status": "open",
+      "status": "qa",
       "priority": "low",
       "sprint": null,
       "assignedAgentIds": [],
-      "updatedAt": 1784412001974
+      "updatedAt": 1784449447058
     },
     {
       "issueRef": "#51",
@@ -602,6 +602,16 @@
       "sprint": null,
       "assignedAgentIds": [],
       "updatedAt": 1784412015509
+    },
+    {
+      "issueRef": "#54",
+      "path": "54",
+      "title": "Exercice à plusieurs étapes",
+      "status": "open",
+      "priority": "medium",
+      "sprint": "1bb8bdf2-9c35-4f53-9a31-1390a47bec63",
+      "assignedAgentIds": [],
+      "updatedAt": 1784449895057
     }
   ]
 }