docs: update collapse patterns documentation in AGENTS.md

AGENTS.md

@@ -215,9 +215,15 @@ local options = {
 3. Now toggle/expand works correctly
 
 ### Default Collapse Patterns
-- `^%s*{%s*EXTERNAL` - Variable attributes: `{EXTERNALACCESSIBLE := 'false'; ...}`
-- `^%s*{ S7_` - Block attributes: `{ S7_Optimized_Access := 'TRUE' }`
-- `^%s*{%s*%w+%s*:=` - Generic attributes with assignments
+The `:SCLCollapseAllAttrBlocks` command uses case-insensitive patterns:
+- `EXTERNAL` - Variable attributes: `{EXTERNALACCESSIBLE := 'false'; EXTERNALVISIBLE := 'false'}`
+- `S7_` - Block attributes: `{S7_Optimized_Access := 'TRUE'}`
+- `NonRetain` - NonRetain attribute: `{NonRetain}`
+- `Retain` - Retain attribute: `{Retain}`
+- `%w+ :=` - Generic attributes with assignments: `{key := 'value'}`
+- `%w+` - Single word attributes: `{SomeAttribute}`
+
+Works in `.scl`, `.udt`, and `.db` files.
 
 ### Per-Variable Collapse Rules
 Control collapsing per variable using rules (evaluated before global patterns):