Add dedicated server bootstrap target

Docs/Ops/DedicatedServerBuildRunbook.md

@@ -4,6 +4,19 @@ Agrarian's multiplayer server target is Linux. Windows-Builder remains the
 interactive Unreal build machine, but the server artifact should run on an
 Ubuntu cloud VM or other Linux host.
 
+## Public Endpoint Convention
+
+Use this MVP gameplay endpoint unless a later deployment requires a different
+host name:
+
+- DNS name: `play.agrariangame.com`
+- Unreal gameplay traffic: `7777/udp`
+- SSH: admin IPs only
+
+When the first Ubuntu gameplay VM is created, point the `play` A/AAAA record at
+that VM. Do not point this name at the tile server; tile delivery and gameplay
+should remain separate until a deliberate combined-host decision is made.
+
 ## Build Machine
 
 Use Windows-Builder for the first repeatable build lane:
@@ -16,6 +29,23 @@ Use Windows-Builder for the first repeatable build lane:
 The server target is `AgrarianGameServer`, defined in
 `Source/AgrarianGameServer.Target.cs`.
 
+## Ubuntu Host Bootstrap
+
+Prepare a new Ubuntu gameplay host with:
+
+```bash
+sudo Operations/cloud-game-server/bootstrap_ubuntu_game_server.sh play.agrariangame.com
+```
+
+The script installs baseline packages, creates an `agrarian` service user,
+creates `/opt/agrarian/server`, writes a systemd unit named
+`agrarian-game-server`, and opens `7777/udp` with `ufw` when available.
+
+For DigitalOcean or another cloud provider later, create an Ubuntu LTS droplet
+or VM, copy this repository or just the script onto the host, run the bootstrap
+script, then copy the `Builds/LinuxServerDevelopment` package contents into
+`/opt/agrarian/server`.
+
 ## Build Command
 
 From an elevated or normal Command Prompt on Windows-Builder:
@@ -48,6 +78,13 @@ First cloud/server launch target:
 ./AgrarianGameServer L_GroundZeroTerrain_Test?listen -log -port=7777
 ```
 
+Systemd launch target created by the bootstrap script:
+
+```bash
+sudo systemctl restart agrarian-game-server
+sudo journalctl -u agrarian-game-server -f
+```
+
 Open firewall ports only as needed:
 
 - `7777/udp` for Unreal gameplay traffic.