complete codex docs

docs/features/LOGGING_SYSTEM.md

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+# Logging System
+
+## Current State
+
+Logging comes from multiple places:
+
+- agent screen logs
+- console logs
+- update logs
+- scheduler logs
+- admin/logger history
+
+Important references:
+
+- `Panel/modules/gamemanager/log.php`
+- `Panel/modules/gamemanager/view_server_log.php`
+- `Panel/modules/gamemanager/get_server_log.php`
+- `Agent_Linux/ogp_agent.pl`
+- `Agent-Windows/ogp_agent.pl`
+
+## What Works
+
+- live log retrieval exists
+- logs can be fetched through the Panel
+- the viewer can update via AJAX
+
+## What Still Needs Cleanup
+
+- better startup failure diagnostics
+- clearer newest-log-file selection
+- better error highlighting
+- better downloadable log history
+