CUST-WP-0054 T01-T03: fleet architecture, de-hub runbook, drain plan

Documents the three-machine role model, fleet mesh topology, coulombcore
freeze policy, and ordered drain sequence. Adds railiance01 systemd tunnel
install assets and refreshes ops service inventory to reflect 2026-07-03
production placement (cluster State Hub, fleet mesh, draining coulombcore).

infra/fleet-mesh/systemd/fleet-issue-core-coulombcore.service

@@ -0,0 +1,21 @@
+[Unit]
+Description=Fleet mesh issue-core forward tunnel (railiance01 to coulombcore cluster)
+After=network-online.target
+Wants=network-online.target
+StartLimitIntervalSec=0
+
+[Service]
+Type=simple
+ExecStart=/usr/bin/ssh -N \
+  -L 127.0.0.1:18765:10.43.103.154:8765 \
+  -i /home/tegwick/.ssh/id_ops \
+  -o ServerAliveInterval=10 \
+  -o ServerAliveCountMax=3 \
+  -o ExitOnForwardFailure=yes \
+  -o StrictHostKeyChecking=accept-new \
+  tegwick@92.205.130.254
+Restart=always
+RestartSec=5
+
+[Install]
+WantedBy=default.target

infra/fleet-mesh/systemd/fleet-state-hub-coulombcore.service

@@ -0,0 +1,21 @@
+[Unit]
+Description=Fleet mesh State Hub forward tunnel (railiance01 to coulombcore cluster)
+After=network-online.target
+Wants=network-online.target
+StartLimitIntervalSec=0
+
+[Service]
+Type=simple
+ExecStart=/usr/bin/ssh -N \
+  -L 127.0.0.1:18000:10.43.170.94:8000 \
+  -i /home/tegwick/.ssh/id_ops \
+  -o ServerAliveInterval=10 \
+  -o ServerAliveCountMax=3 \
+  -o ExitOnForwardFailure=yes \
+  -o StrictHostKeyChecking=accept-new \
+  tegwick@92.205.130.254
+Restart=always
+RestartSec=5
+
+[Install]
+WantedBy=default.target