feat(web): add Mission Control page layout shell

apps/web/src/app/(authenticated)/mission-control/page.tsx

@@ -0,0 +1,5 @@
+import { MissionControlLayout } from "@/components/mission-control/MissionControlLayout";
+
+export default function MissionControlPage(): React.JSX.Element {
+  return <MissionControlLayout />;
+}

apps/web/src/components/layout/AppSidebar.tsx

@@ -156,6 +156,26 @@ function IconTerminal(): React.JSX.Element {
   );
 }
 
+function IconMissionControl(): React.JSX.Element {
+  return (
+    <svg
+      width="16"
+      height="16"
+      viewBox="0 0 16 16"
+      fill="none"
+      stroke="currentColor"
+      strokeWidth="1.5"
+      aria-hidden="true"
+    >
+      <circle cx="8" cy="8" r="1.5" />
+      <path d="M11 5a4.25 4.25 0 0 1 0 6" />
+      <path d="M5 5a4.25 4.25 0 0 0 0 6" />
+      <path d="M13.5 2.5a7.75 7.75 0 0 1 0 11" />
+      <path d="M2.5 2.5a7.75 7.75 0 0 0 0 11" />
+    </svg>
+  );
+}
+
 function IconSettings(): React.JSX.Element {
   return (
     <svg
@@ -260,6 +280,11 @@ const NAV_GROUPS: NavGroup[] = [
         label: "Terminal",
         icon: <IconTerminal />,
       },
+      {
+        href: "/mission-control",
+        label: "Mission Control",
+        icon: <IconMissionControl />,
+      },
     ],
   },
   {

apps/web/src/components/mission-control/GlobalAgentRoster.tsx

@@ -0,0 +1,16 @@
+"use client";
+
+import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
+
+export function GlobalAgentRoster(): React.JSX.Element {
+  return (
+    <Card className="flex h-full min-h-0 flex-col">
+      <CardHeader>
+        <CardTitle className="text-base">Agent Roster</CardTitle>
+      </CardHeader>
+      <CardContent className="flex flex-1 items-center justify-center text-sm text-muted-foreground">
+        No active agents
+      </CardContent>
+    </Card>
+  );
+}

apps/web/src/components/mission-control/MissionControlLayout.tsx

@@ -0,0 +1,21 @@
+"use client";
+
+import { GlobalAgentRoster } from "@/components/mission-control/GlobalAgentRoster";
+import { MissionControlPanel } from "@/components/mission-control/MissionControlPanel";
+
+const DEFAULT_PANEL_SLOTS = ["panel-1", "panel-2", "panel-3", "panel-4"] as const;
+
+export function MissionControlLayout(): React.JSX.Element {
+  return (
+    <section className="h-full min-h-0 overflow-hidden" aria-label="Mission Control">
+      <div className="grid h-full min-h-0 gap-4 xl:grid-cols-[280px_minmax(0,1fr)]">
+        <aside className="h-full min-h-0">
+          <GlobalAgentRoster />
+        </aside>
+        <main className="h-full min-h-0 overflow-hidden">
+          <MissionControlPanel panels={DEFAULT_PANEL_SLOTS} />
+        </main>
+      </div>
+    </section>
+  );
+}

apps/web/src/components/mission-control/MissionControlPanel.tsx

@@ -0,0 +1,17 @@
+"use client";
+
+import { OrchestratorPanel } from "@/components/mission-control/OrchestratorPanel";
+
+interface MissionControlPanelProps {
+  panels: readonly string[];
+}
+
+export function MissionControlPanel({ panels }: MissionControlPanelProps): React.JSX.Element {
+  return (
+    <div className="grid h-full min-h-0 auto-rows-fr grid-cols-1 gap-4 overflow-y-auto pr-1 md:grid-cols-2">
+      {panels.map((panelId) => (
+        <OrchestratorPanel key={panelId} />
+      ))}
+    </div>
+  );
+}

apps/web/src/components/mission-control/OrchestratorPanel.tsx

@@ -0,0 +1,16 @@
+"use client";
+
+import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
+
+export function OrchestratorPanel(): React.JSX.Element {
+  return (
+    <Card className="flex h-full min-h-[220px] flex-col">
+      <CardHeader>
+        <CardTitle className="text-base">Orchestrator Panel</CardTitle>
+      </CardHeader>
+      <CardContent className="flex flex-1 items-center justify-center text-sm text-muted-foreground">
+        Select an agent
+      </CardContent>
+    </Card>
+  );
+}

apps/web/src/hooks/useMissionControl.ts

@@ -0,0 +1,10 @@
+interface UseMissionControlResult {
+  sessions: [];
+  loading: boolean;
+  error: null;
+}
+
+// Stub — will be wired in P2-002
+export function useMissionControl(): UseMissionControlResult {
+  return { sessions: [], loading: false, error: null };
+}