feat: improve formatter and attribute block handling

- Format multi-line assignments with proper alignment
- Format FB calls in multiline style with parameter alignment
- Auto-expand collapsed attribute blocks before save
- Rename command from LspSCLFormat to SCLFormat
- Condense AGENTS.md and add testing section with reference project

README.md

@@ -27,7 +27,9 @@ A comprehensive Neovim/LazyVim plugin providing **Language Server Protocol (LSP)
 ### Formatter
 | Feature | Description |
 |---------|-------------|
-| **Document Formatting** | Format entire SCL files |
+| **Document Formatting** | Format entire SCL files with `:SCLFormat` |
+| **Multi-line Assignments** | Preserves and formats multi-line expressions with proper alignment |
+| **FB Call Formatting** | Formats function block calls in multiline style |
 | **Indentation** | Proper block indentation |
 | **Keyword Casing** | Maintains SCL keyword casing |
 
@@ -119,8 +121,7 @@ require("scl_lsp").setup({
 | `:SCLRescanWorkspaceTypes` | Rescan workspace for types and DBs |
 | `:SCLPrefixWord` | Manually prefix current word with `#` |
 | `:SCLMultilineParams` | Fill multiline parameters for FB/Function call |
-| `:LspSCLFormat` | Format current SCL file |
-| `:SCLGeneratePlcJson` | Generate plc.data.json from data_types/ |
+| `:SCLFormat` | Format current SCL file |
 | `:SCLToggleAttrBlock` | Toggle attribute block under cursor |
 | `:SCLExpandAllAttrBlocks` | Expand all `{...}` blocks in buffer |
 | `:SCLCollapseAllAttrBlocks` | Collapse all matching attribute blocks |
@@ -159,7 +160,7 @@ statCounter{...} : Int;
 - Use `<Leader>xae` to expand all blocks in buffer
 - Use `<Leader>xac` to collapse all blocks
 
-**Note:** The formatter has automatic collapsing disabled by default to preserve compatibility with the toggle feature. Format with `:LspSCLFormat` first, then use `:SCLCollapseAllAttrBlocks` to collapse while preserving the ability to expand later.
+**Note:** Collapsed blocks are automatically expanded before saving to preserve full content on disk. Use `:SCLFormat` to format, then `:SCLCollapseAllAttrBlocks` to collapse while preserving the ability to expand later.
 
 ## External UDT Support