complete codex docs

docs/features/INSTALLERS.md

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+# Installers
+
+## Current State
+
+Installer behavior is split across game XML, gamemanager startup, addonsmanager, SteamCMD helpers, and agent scripts.
+
+Important references:
+
+- `Panel/modules/config_games/schema_server_config.xml`
+- `Panel/modules/gamemanager/home_handling_functions.php`
+- `Panel/modules/addonsmanager/module.php`
+- `Panel/modules/steam_workshop/module.php`
+- `Agent_Linux/ogp_agent.pl`
+- `Agent-Windows/ogp_agent.pl`
+
+## Installer Types Seen In The Codebase
+
+- SteamCMD-based installs
+- download/extract installs
+- script-driven installs
+- Workshop/content installs
+- profile/content copy workflows
+
+## Recommended Model
+
+Installer strategy should come from game capability metadata. The agent should execute trusted strategies, not arbitrary customer commands.
+