feat(terminals): durcit le portail d'écriture de délégation

Fiabilise la livraison des délégations inter-agents dans le terminal :
écriture par chunks UTF-8 bornés (512 o, délai 8 ms) pour éviter les
comportements de paste/drop des TUI sur agents froids, et réconciliation
de l'attachement front (frontAttachedAgentRef / reconcileFrontAttachment)
pour ne reporter « front attaché » qu'une fois les DelegationReady
réellement consommés. Tests vitest associés.

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

frontend/src/features/projects/ProjectsView.tsx

@@ -28,11 +28,11 @@
  *   - getByRole("alert") — error display
  */
 
-import { useState } from "react";
+import { useEffect, useState } from "react";
 
 import type { LayoutInfo } from "@/domain";
 import { LayoutGrid, LayoutTabs } from "@/features/layout";
-import { AgentsPanel, ResumeProjectPanel } from "@/features/agents";
+import { AgentsPanel } from "@/features/agents";
 import { TemplatesPanel } from "@/features/templates";
 import { SkillsPanel } from "@/features/skills";
 import { MemoryPanel } from "@/features/memory";
@@ -79,6 +79,15 @@ export function ProjectsView() {
 
   const active = vm.openTabs.find((t) => t.id === vm.activeTabId) ?? null;
 
+  // Reset the active layout whenever the active project changes. `activeLayout`
+  // is only repopulated asynchronously by `LayoutTabs` (which re-fetches the new
+  // project's layouts). Without this reset, the stale id of the *previous*
+  // project would be handed to `LayoutGrid`/`GitGraphView` during the gap, and
+  // loading it against the new project's store fails with "not found: layout X".
+  useEffect(() => {
+    setActiveLayout(null);
+  }, [active?.id]);
+
   const activeLayoutKind = activeLayout?.kind ?? "terminal";
 
   const canCreate = name.trim().length > 0 && root.trim().length > 0 && !vm.busy;
@@ -355,17 +364,6 @@ export function ProjectsView() {
           )}
         </main>
       </div>
-
-      {/* ── Reopen resume panel (§15.2) ──
-          Mounted per active project (keyed by id) so it re-pulls the resumable
-          inventory on every open/switch; it renders nothing when empty. */}
-      {active && (
-        <ResumeProjectPanel
-          key={`resume-${active.id}`}
-          projectId={active.id}
-          cwd={active.root}
-        />
-      )}
     </div>
   );
 }