Phase 004: remove the desktop shell, website tooling, and bundled hermes CLI

- Drop all desktop/Electron branches, scripts, and UI (title bar, pets,
  desktop bridge); LAN endpoint kind is now web/custom only
- Replace the bundled hermes CLI with user-side installation: add
  GET /api/hermes/cli-status plus a HermesMissingView onboarding guide
- Remove the version-management UI (snapshots handled by git) and prune
  dead website/mcu/claude scripts and lockfile entries

packages/client/src/api/hermes/system.ts

@@ -140,6 +140,35 @@ export async function checkHealth(): Promise<HealthResponse> {
   return request<HealthResponse>('/health')
 }
 
+export interface HermesCliStatus {
+  available: boolean
+  bin?: string
+}
+
+let cliProbePromise: Promise<boolean> | null = null
+
+async function probeHermesCli(): Promise<boolean> {
+  try {
+    const res = await request<HermesCliStatus>('/api/hermes/cli-status')
+    return res.available !== false
+  } catch {
+    // Fail open: probe errors (older servers, mocked backends) must not block the app.
+    return true
+  }
+}
+
+/** Cached per page load; the router guard probes once before showing the app. */
+export function checkHermesCliAvailable(): Promise<boolean> {
+  if (!cliProbePromise) {
+    cliProbePromise = probeHermesCli()
+  }
+  return cliProbePromise
+}
+
+export function resetHermesCliProbe(): void {
+  cliProbePromise = null
+}
+
 export async function triggerUpdate(): Promise<{ success: boolean; message: string }> {
   return request<{ success: boolean; message: string }>('/api/hermes/update', { method: 'POST' })
 }