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>

Dockerfile

@@ -85,6 +85,17 @@ COPY agents/beads-task-runner.md /usr/share/agent-seed/beads-task-runner.md
 COPY agents/recruiter-triage.md /usr/share/agent-seed/recruiter-triage.md
 COPY agents/nextcloud-todos-planner.md /usr/share/agent-seed/nextcloud-todos-planner.md
 COPY agents/nextcloud-todos-exec.md /usr/share/agent-seed/nextcloud-todos-exec.md
+# The breakglass deployment (separate stack) seeds this one instead of the
+# untrusted-input agents; its init container copies whichever it needs.
+COPY agents/breakglass.md /usr/share/agent-seed/breakglass.md
+
+# Breakglass entrypoint. The breakglass Deployment overrides the default CMD
+# with this (ssh-agent bootstrap + ssh aliases, then uvicorn for the breakglass
+# app). It ships in every image but only that deployment runs it. The built
+# frontend lives under app/breakglass/static/ (committed — no in-cluster build,
+# per ADR-0002), so the `COPY app/` above carries it in.
+COPY docker-entrypoint-breakglass.sh /srv/docker-entrypoint-breakglass.sh
+RUN chmod 0755 /srv/docker-entrypoint-breakglass.sh
 
 USER agent
 WORKDIR /workspace/infra