complete codex docs

docs/features/RCON_SYSTEM.md

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+# RCON System
+
+## Current State
+
+RCON support is part of the gamemanager and a dedicated admin RCON module.
+
+Important references:
+
+- `Panel/modules/gamemanager/module.php`
+- `Panel/modules/gamemanager/home_handling_functions.php`
+- `Panel/modules/gamemanager/rcon.php`
+- `Panel/modules/rcon/module.php`
+
+## Current Uses
+
+- admin console commands
+- warning messages before restart
+- diagnostic control for supported games
+- scheduler-friendly command execution
+
+## Recommended Direction
+
+- keep presets
+- validate commands where possible
+- do not expose arbitrary commands to customers by default
+- log every command with user and server context
+