fix(#105): corrige le contexte plugin pour hello-plugin

Ajoute logger, subscriptions et commandes scindées au contexte plugin
activé. Les plugins full-trust s'attendent à ce shape public.

frontend/src/features/plugins/PluginsPanel.tsx

@@ -13,6 +13,7 @@ import { useState } from "react";
 import type { PluginAdmin, PluginLifecycleState, PluginReview } from "@/domain";
 import { Button, Panel } from "@/shared";
 import { PluginConfirmDialog as ConfirmDialog } from "./PluginConfirmDialog";
+import { usePluginRuntime } from "./PluginRuntimeProvider";
 import { usePlugins } from "./usePlugins";
 
 const STATE_LABEL: Record<PluginLifecycleState, string> = {
@@ -36,6 +37,7 @@ interface InstallFlow {
 
 export function PluginsPanel() {
   const vm = usePlugins();
+  const pluginRuntime = usePluginRuntime();
   const [pendingAction, setPendingAction] = useState<PendingAction | null>(null);
   const [installFlow, setInstallFlow] = useState<InstallFlow | null>(null);
   const [installFlowError, setInstallFlowError] = useState<string | null>(null);
@@ -108,6 +110,24 @@ export function PluginsPanel() {
         </p>
       )}
 
+      {pluginRuntime.failures.length > 0 && (
+        <Panel className="border-warning/40">
+          <div className="flex flex-col gap-1">
+            <p role="alert" className="text-sm font-medium text-warning">
+              Certains plugins installés n'ont pas pu être chargés.
+            </p>
+            <ul className="flex flex-col gap-0.5">
+              {pluginRuntime.failures.map((failure) => (
+                <li key={`${failure.pluginId}:${failure.reason}`} className="text-xs text-muted">
+                  <span className="font-medium text-content">{failure.pluginId}</span> :{" "}
+                  {failure.reason}
+                </li>
+              ))}
+            </ul>
+          </div>
+        </Panel>
+      )}
+
       {vm.plugins.length === 0 ? (
         <Panel>
           <p className="text-sm text-muted">Aucun plugin installé.</p>