chore(ideai): état d'orchestration du sprint #54 (progression téléchargement)

Métadonnée runtime IdeA : tickets, sprints, mémoire et background-tasks
mis à jour au fil du sprint de progression fine du téléchargement (#54).
Séparé du code de feature (last-writer-wins, état non applicatif).

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

.ideai/tickets/43/carnet.md

@@ -0,0 +1,6 @@
+---
+issueRef: "#43"
+version: 1
+updatedBy: {"kind":"user"}
+updatedAt: 1783879315858
+---

.ideai/tickets/43/issue.md

@@ -0,0 +1,15 @@
+---
+id: "63e80352-8ce1-4116-9ec3-b4cb3fc5c077"
+number: 43
+title: "Systeme de plugins"
+status: "open"
+priority: "medium"
+sprint: null
+links: []
+agentRefs: []
+createdBy: {"kind":"user"}
+updatedBy: {"kind":"user"}
+createdAt: 1783879315858
+updatedAt: 1783879315858
+version: 1
+---