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

lua/scl/attr_toggle.lua

@@ -80,23 +80,24 @@ function M.toggle_attr_block()
 end
 
 -- Expand all collapsed blocks in current buffer
-function M.expand_all_attr_blocks()
+function M.expand_all_attr_blocks(opts)
+  opts = opts or {}
   local bufnr = vim.api.nvim_get_current_buf()
   local lines = vim.api.nvim_buf_get_lines(bufnr, 0, -1, false)
   local count = 0
   
   if not buffer_attr_state[bufnr] then
-    vim.notify("No collapsed blocks to expand", vim.log.levels.INFO)
+    if not opts.silent then
+      vim.notify("No collapsed blocks to expand", vim.log.levels.INFO)
+    end
     return
   end
   
   for state_key, state in pairs(buffer_attr_state[bufnr]) do
     if state.is_collapsed then
-      -- state.line_num is 1-indexed, but nvim_buf_get_lines returns 0-indexed array
       local line = lines[state.line_num]
       
       if line then
-        -- Find the collapsed {...} and replace with expanded content
         local new_line = line:sub(1, state.start_col) .. state.expanded .. line:sub(state.start_col + 4)
         lines[state.line_num] = new_line
         state.is_collapsed = false
@@ -106,7 +107,9 @@ function M.expand_all_attr_blocks()
   end
   
   vim.api.nvim_buf_set_lines(bufnr, 0, -1, false, lines)
-  vim.notify("Expanded " .. count .. " attribute block(s)", vim.log.levels.INFO)
+  if not opts.silent and count > 0 then
+    vim.notify("Expanded " .. count .. " attribute block(s)", vim.log.levels.INFO)
+  end
 end
 
 -- Helper to make a pattern case-insensitive
@@ -193,6 +196,25 @@ end
 function M.setup()
   local augroup = vim.api.nvim_create_augroup("SCLAttrToggle", { clear = true })
   
+  vim.api.nvim_create_autocmd("BufWritePre", {
+    group = augroup,
+    pattern = { "*.scl", "*.udt", "*.db" },
+    callback = function(args)
+      if buffer_attr_state[args.buf] then
+        local has_collapsed = false
+        for _, state in pairs(buffer_attr_state[args.buf]) do
+          if state.is_collapsed then
+            has_collapsed = true
+            break
+          end
+        end
+        if has_collapsed then
+          M.expand_all_attr_blocks({ silent = true })
+        end
+      end
+    end,
+  })
+  
   vim.api.nvim_create_autocmd("BufUnload", {
     group = augroup,
     pattern = { "*.scl", "*.udt", "*.db" },