complete codex docs

docs/features/FILE_EDITOR.md

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+# File Editor
+
+## Current State
+
+File editing is split across LiteFM, FTP, edit-config helpers, and agent remote read/write methods.
+
+Important references:
+
+- `Panel/modules/litefm/`
+- `Panel/modules/ftp/`
+- `Panel/modules/editconfigfiles/`
+- `Panel/includes/lib_remote.php`
+
+## What It Should Provide
+
+- safe browsing inside server home roots
+- text editing with syntax highlighting
+- backups before save
+- restore last saved version
+- read-only protected paths
+- large-file warnings
+
+## Main Risk
+
+Customer access must never extend into agent control files, shared secrets, or other users' server homes.
+