chore(wip): checkpoint P8/C avant chantier Codex inter-agents

Sauvegarde de l'arbre de travail en cours (persistance P8, conversations
C-series, write-portal frontend, médiation d'entrée) avant d'attaquer le
support de la délégation inter-agents pour les profils Codex.

Le round-trip inter-agent question/réponse est couvert sans tokens par
les tests loopback existants (state::mcp_e2e_loopback_tests).

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

.ideai/layouts.json

@@ -1,24 +1,24 @@
 {
   "version": 1,
-  "activeId": "2fc8a7df-0bf6-4116-acd6-895ae04aa3e5",
+  "activeId": "1af250f0-65ef-4b78-8905-b1746673aee0",
   "layouts": [
     {
-      "id": "2fc8a7df-0bf6-4116-acd6-895ae04aa3e5",
+      "id": "1af250f0-65ef-4b78-8905-b1746673aee0",
       "name": "Default",
       "kind": "terminal",
       "tree": {
         "root": {
           "type": "split",
           "node": {
-            "id": "1eb96c70-e954-42d0-907b-f8528d0442bf",
+            "id": "56ffe1e4-636c-458d-9ab2-7e278fd45897",
             "direction": "row",
             "children": [
               {
                 "node": {
                   "type": "leaf",
                   "node": {
-                    "id": "db40e3de-4980-4bed-b6fa-1c136f49d30e",
-                    "session": "d7d4c099-eda3-4b33-82e6-e6f8d57b8b97",
+                    "id": "c3319a9a-1345-4fa2-b64e-5f3fe00d13d8",
+                    "session": "4965c71a-f69f-4c06-90de-ecb81acff710",
                     "agent": "a6ced819-b893-4213-b003-9e9dc79b9641",
                     "agentWasRunning": true
                   }
@@ -27,12 +27,36 @@
               },
               {
                 "node": {
-                  "type": "leaf",
+                  "type": "split",
                   "node": {
-                    "id": "92826533-1a7c-4d9e-b6b4-f1e904ddc81a",
-                    "session": "5d20f53a-ac76-4677-9a6f-064d3319cc73",
-                    "agent": "edce8090-4c57-47c5-a319-c08fd172438b",
-                    "agentWasRunning": true
+                    "id": "8cf1c06e-2654-45a3-bf17-a9c2507da935",
+                    "direction": "column",
+                    "children": [
+                      {
+                        "node": {
+                          "type": "leaf",
+                          "node": {
+                            "id": "69dc2e23-86f5-4770-84c4-b1b4b2c25299",
+                            "session": "11fbf6b4-eb62-4420-95e9-feb2ff667c43",
+                            "agent": "c932c770-cf36-4fb2-a966-71bb1644e4b4",
+                            "agentWasRunning": true
+                          }
+                        },
+                        "weight": 1.0
+                      },
+                      {
+                        "node": {
+                          "type": "leaf",
+                          "node": {
+                            "id": "b9251e74-3bd5-43ee-90e5-e6bb87faab38",
+                            "session": "69a3bf52-05ef-45c0-badf-26b0d8224f0e",
+                            "agent": "aefdbd61-e3d4-4bc1-9f42-c259446a97b5",
+                            "agentWasRunning": true
+                          }
+                        },
+                        "weight": 1.0
+                      }
+                    ]
                   }
                 },
                 "weight": 1.0