breakglass: in-cluster emergency-recovery UI for the devvm

Viktor wanted a web UI on the claude service to act as his breakglass when
the devvm is down: open it, have Claude SSH in to diagnose/repair, and
power-cycle the VM via the Proxmox host if needed. This is the app half
(the infra stack + host bootstrap live in the infra repo).

New, ISOLATED ASGI app under app/breakglass/ (never imports app.main, so the
untrusted-input agents — recruiter-triage, nextcloud-todos — can't share a
process with the root-on-devvm / PVE-reset SSH key):
- pve.py: the LLM-independent power-verb path (status|forensics|reset|stop|
  start|cycle on VM 102), whitelist-validated client-side, executed over the
  forced-command SSH key (list argv, no shell).
- agent_session.py: multi-turn streamed chat — claude -p --session-id /
  --resume with --output-format stream-json, translated to a small SSE
  vocabulary (session/text/tool/result/error/done).
- auth.py: edge Authentik header OR bearer; fail-closed.
- server.py: FastAPI (session/chat-SSE/pve-verb routes) + serves the Svelte UI.
- Svelte SPA (frontend/, built into app/breakglass/static/ and committed — no
  in-cluster build, per ADR-0002): streamed chat + danger-styled manual VM
  controls with confirm-on-mutate.
- agents/breakglass.md: narrow tools (Bash/Read/Grep/Glob, no web), taught the
  ssh devvm / ssh pve aliases and cycle-vs-reset.
- docker-entrypoint-breakglass.sh: ssh-agent bootstrap from the mounted key +
  ssh aliases, then uvicorn app.breakglass.server. The breakglass Deployment
  overrides the image CMD with this; the existing service is untouched.

26 new tests (verb whitelist incl. injection attempts, stream-json→SSE
translation, auth gating, route behaviour); full suite 58 green.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

frontend/vite.config.js

@@ -0,0 +1,20 @@
+import { defineConfig } from 'vite';
+import { svelte } from '@sveltejs/vite-plugin-svelte';
+
+// The compiled SPA is emitted into the FastAPI app's static dir. FastAPI serves
+// app/breakglass/static/index.html at "/" and mounts the directory, so the
+// build output must be plain static files (plain Svelte, not SvelteKit).
+//
+// base: './' makes every asset reference relative, so the bundle loads no
+// matter what path the edge proxy mounts the app under.
+export default defineConfig({
+  plugins: [svelte()],
+  base: './',
+  build: {
+    outDir: '../app/breakglass/static',
+    emptyOutDir: true,
+    // Keep the asset graph small and predictable for an air-gapped cluster:
+    // no remote chunks, no CDN — everything bundled here.
+    assetsInlineLimit: 0,
+  },
+});