Named-bridge-network production Compose (not host networking, unlike dev)
for rn-platform-01; egress-proxy + agents for rn-lab-host-01. Caddy reverse
proxy, single public origin, Grafana restricted to management_cidr.
iptables-restore firewall rulesets for all three hosts (Proxmox host,
rn-platform-01, rn-lab-host-01) codifying the Platform/Lab-Host boundary:
no student-to-student traffic, no direct Proxmox exposure, no direct
Postgres/Provisioner exposure from the Lab Host.
Mutual TLS for the Provisioner<->Lab Host Docker connection: certificate
generation/verification scripts, dockerd TLS config, firewall-restricted
port 2376. Application support already existed since Phase 1; this is
purely the operational half.
Validated: docker compose config, caddy validate, firewall structural lint,
and a real openssl s_server/s_client mTLS handshake proving the cert chain
and mutual-auth rejection (legitimate client verified, rogue client
correctly rejected with verify code 19).
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