docs: add auto-editing features section to AGENTS.md

AGENTS.md

@@ -283,6 +283,34 @@ The LSP supports goto declaration functionality for:
 
 Usage: Place cursor on a variable or type name and press `gD` (or use LSP client command).
 
+## Auto-Editing Features
+
+### Auto-Uppercase Keywords
+When typing SCL keywords followed by a space, they are automatically converted to uppercase:
+- `if ` → `IF `
+- `then ` → `THEN `
+- `end_if` → `END_IF`
+- etc.
+
+Works in `.scl`, `.udt`, and `.db` files.
+
+### Auto-Semicolon for Control Structures
+When pressing Enter after an `END_*` control structure keyword, a semicolon is automatically added:
+- `END_IF` → `END_IF;`
+- `END_FOR` → `END_FOR;`
+- `END_WHILE` → `END_WHILE;`
+- `END_REPEAT` → `END_REPEAT;`
+- `END_CASE` → `END_CASE;`
+
+Block definitions (END_VAR, END_FUNCTION, etc.) are NOT affected.
+
+### Auto-Prefix Local Variables
+Local variables are automatically prefixed with `#` when typing space or semicolon after BEGIN:
+- `myVar := ` → `#myVar := `
+- `counter.in` → `#counter.in` (on dot)
+
+Can be toggled with `:lua require("scl.auto_prefix").toggle()`.
+
 ## Keybindings (SCL/UDT files)
 
 ### Attribute Block Toggle
@@ -304,9 +332,6 @@ Interactive expand/collapse of individual `{...}` blocks (uses `<Leader>x` prefi
 
 | Key | Mode | Description |
 |-----|------|-------------|
-| `<Leader>xa` | Normal/Insert | Toggle attribute block under cursor |
-| `<Leader>xae` | Normal | Expand all attribute blocks |
-| `<Leader>xac` | Normal | Collapse all attribute blocks |
 | `<Space>mp` | Insert | Fill multiline FB parameters |
 | `<Tab>` | Insert | Jump to next parameter or regular Tab |