feat: implement clean TDD-driven editor with enhanced status dialog

- Replace legacy editor with clean object-oriented architecture
- Add comprehensive test-driven Section, SectionManager, and DOMRenderer classes
- Implement four-layer content management with proper action semantics
- Add multiple concurrent section editing capability
- Implement intelligent section splitting with heading detection
- Add enhanced status dialog with repository info, version, and save filename
- Include git commit information and modification status
- Provide actual save filename preview instead of source filename
- Maintain proper section positioning and global reset functionality

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

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

markitect/cli.py

@@ -101,7 +101,7 @@ def detect_execution_mode():
 def should_use_associated_files():
     """Determine if commands should use associated files behavior."""
     return detect_execution_mode() == 'interactive'
-from .document_manager import DocumentManager
+# DocumentManager removed - using CleanDocumentManager directly in commands
 from .serializer import ASTSerializer
 from .cache_service import CacheDirectoryService
 from .ast_service import ASTService

markitect/plugins/builtin/markdown_commands.py

@@ -16,7 +16,7 @@ from typing import Dict, Any
 
 from markitect.plugins.base import CommandPlugin, PluginMetadata, PluginType
 from markitect.plugins.decorators import register_plugin
-from markitect.document_manager import DocumentManager
+# DocumentManager removed - using CleanDocumentManager directly
 from markitect.serializer import ASTSerializer
 
 
@@ -1659,7 +1659,7 @@ def md_list_command(ctx, output_format, names_only):
 @click.option('--css', type=click.Path(),
               help='Custom CSS file to include')
 @click.option('--edit', is_flag=True,
-              help='Open in live edit mode with preview')
+              help='Open in interactive edit mode with stable section editing')
 @click.option('--editor-theme', default='github',
               type=click.Choice(['github', 'monokai', 'tomorrow', 'dark']),
               help='Editor theme for live edit mode (default: github)')
@@ -1704,17 +1704,20 @@ def md_render_command(ctx, input_file, output, template, css, edit, editor_theme
             ensure_publication_directory(pub_dir)
             output_path = pub_dir / get_output_filename(input_path)
 
-        # Initialize document manager
-        doc_manager = DocumentManager(config.get('db_manager'))
+        # Initialize clean document manager
+        from markitect.clean_document_manager import CleanDocumentManager
+        doc_manager = CleanDocumentManager(config.get('db_manager'))
 
         # Render the file
         if edit:
-            # Live edit mode - generate HTML with editing capabilities
+            # Edit mode - generate HTML with editing capabilities
             result = doc_manager.render_file(input_file, str(output_path),
                                            template=template, css=css,
-                                           edit_mode=True, editor_theme=editor_theme,
+                                           edit_mode=True,
+                                           editor_theme=editor_theme,
                                            keyboard_shortcuts=keyboard_shortcuts)
-            click.echo(f"✓ Rendered with editing capabilities to: {output_path}")
+
+            click.echo(f"✓ Rendered with interactive editing capabilities to: {output_path}")
 
             if config.get('verbose', False):
                 click.echo(f"Editor theme: {editor_theme}")