fix: also warn on unassigned input params + collapse all-unassigned calls

- SCL006 now fires for both unassigned inputs (IN := <-,) and outputs (Q =>)
- Formatter removes both IN := and Q => when no value follows
- When ALL params are unassigned, the call collapses to name()

src/diagnostics.lua

@@ -254,7 +254,16 @@ function M.validate_diagnostics(content, workspace_types, root_dir)
     if trimmed:match("^%s*//") or trimmed:match("^%s*%(%*") then
       -- Skip comments
     else
-      -- Check for unassigned output parameters in FB/FC calls (e.g. "Q =>")
+      -- Check for unassigned parameters in FB/FC calls
+      for unassigned in line:gmatch("([%w_]+)%s*:=%s*[,%)]") do
+        table.insert(diagnostics, {
+          range = range_to_lsp(line_num, line:find(unassigned, 1, true) - 1, line_num, line:find(unassigned, 1, true) + #unassigned),
+          severity = DiagnosticSeverity.Warning,
+          message = string.format("Unassigned input parameter: %s :=", unassigned),
+          code = "SCL006",
+          source = "tia_lsp",
+        })
+      end
       for unassigned in line:gmatch("([%w_]+)%s*=>%s*[,%)]") do
         table.insert(diagnostics, {
           range = range_to_lsp(line_num, line:find(unassigned, 1, true) - 1, line_num, line:find(unassigned, 1, true) + #unassigned),

src/formatter.lua

@@ -261,10 +261,10 @@ function M.format_document(content, options)
       table.insert(params, last_param)
     end
     
-    -- Remove unassigned output parameters (e.g. "Q =>", "ET =>")
+    -- Remove unassigned parameters (e.g. "IN :=", "Q =>", "ET =>")
     local filtered = {}
     for _, p in ipairs(params) do
-      if not p:match("^[%w_]+%s*=>%s*$") then
+      if not p:match("^[%w_]+%s*:=%s*$") and not p:match("^[%w_]+%s*=>%s*$") then
         table.insert(filtered, p)
       end
     end