feat: optimize code quality with pylint analysis and critical fixes - Issue #130

- Fixed critical CLI function redefinition (E0102): renamed duplicate list() to list_paradigms()
- Fixed CLI parameter passing errors (E1120): updated main() calls with standalone_mode=False
- Removed 20+ unused imports across 6 files (W0611 optimization)
- Added missing final newlines to 10 files (C0304 compliance)
- Optimized control flow patterns: removed unnecessary else-after-return
- Enhanced string comparisons using 'in' operator for better readability
- Maintained pylint score at 8.34/10 while eliminating critical runtime risks

Created follow-up Issue #131 for remaining optimizations:
- 200 broad exception handling instances
- 106 variable shadowing cases
- 278 import organization improvements
- 391 line length standardizations

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

markitect/serializer.py

@@ -105,7 +105,7 @@ class ASTSerializer:
             elif token_type == 'list_item_open':
                 # Handle list items
                 indent = '  ' * (level // 2)
-                if markup == '-' or markup == '*':
+                if markup in ('-', '*'):
                     current_line = indent + '- '
                 elif markup.isdigit():
                     current_line = indent + '1. '
@@ -114,9 +114,9 @@ class ASTSerializer:
                     markdown_lines.append(current_line.rstrip())
                     current_line = ""
 
-            elif token_type == 'bullet_list_open' or token_type == 'ordered_list_open':
+            elif token_type in ('bullet_list_open', 'ordered_list_open'):
                 list_level += 1
-            elif token_type == 'bullet_list_close' or token_type == 'ordered_list_close':
+            elif token_type in ('bullet_list_close', 'ordered_list_close'):
                 list_level -= 1
                 if list_level == 0:
                     markdown_lines.append("")  # Empty line after list
@@ -356,4 +356,4 @@ class ASTSerializer:
             # Add to end of AST
             modified_ast.extend(new_tokens)
 
-        return modified_ast
+        return modified_ast