Monitoring group — v0.1.0

Beszel (hub + agent) on a lean AWS Lightsail (~2 GB) host. Hub uses its own
SQLite/PocketBase store (no shared Postgres); status.code42.dev via Caddy; N2.
Agents behind the agents compose profile (off by default); remote agents on the
other hosts are cross-host and deferred. Merged via PR #3.

Verified locally (Colima): smoke green (hub /api/health, N2).

Deploy-time: provision host + DNS/TLS; pair agents with the hub key (incl. remote
hosts).