fix(lsp): Fix LSP server attachment and JSON parsing issues

- Replace lspconfig.scl_lsp registration with vim.lsp.start() + FileType autocmd
  for Neovim 0.11+ compatibility
- Fix Lua reserved keyword 'end' in tables (use bracket notation ['end'])
- Fix JSON decoder pattern matching bugs (s:find -> s:sub:match)
- Add LSP method name conversion (textDocument/didOpen -> textDocument_didOpen)
- Handle request vs notification correctly (only respond to requests with id)
- Strip CRLF line endings for Windows compatibility
- Add semantic token handler aliases
- Update documentation with implementation notes

README.md

@@ -253,10 +253,24 @@ myVar.temperature := 25.5;
 END_FUNCTION_BLOCK
 ```
 
+## Architecture
+
+The plugin uses a standalone LSP server (`src/main.lua`) that communicates via JSON-RPC over stdio. The server handles:
+- Text document synchronization
+- Diagnostics (linting)
+- Formatting
+- Completion, hover, go-to-definition
+- Semantic tokens
+
+The Neovim plugin (`lua/scl_lsp/init.lua`) manages:
+- LSP client lifecycle via `vim.lsp.start()`
+- FileType autocmd for lazy loading
+- blink.cmp integration
+- Workspace scanning for UDTs/DBs
+
 ## Requirements
 
-- **Neovim 0.9+**
-- **nvim-lspconfig** - LSP client
+- **Neovim 0.11+** (uses `vim.lsp.start()`)
 - **nvim-treesitter** - Syntax highlighting
 - **blink.cmp** - Optional, for completion
 - **Lua 5.1+** - LSP server runtime