feat: use actual project data, real usage examples, dry-run/verbose flags, skip-unchanged optimization

- renderer: render_architecture_md accepts Config, uses project name and current date
- renderer: generate real Python usage examples from analyzed symbols
- writer: skip writing files when content unchanged (optimization)
- cli: add --dry-run flag to generate command (lists files without writing)
- cli: add verbose logging for file/module/symbol generation progress

archdoc-cli/src/commands/check.rs

@@ -10,7 +10,7 @@ pub fn check_docs_consistency(root: &str, config: &Config) -> Result<()> {
     let model = analyze_project(root, config)?;
 
     let renderer = archdoc_core::renderer::Renderer::new();
-    let _generated = renderer.render_architecture_md(&model)?;
+    let _generated = renderer.render_architecture_md(&model, None)?;
 
     let architecture_md_path = std::path::Path::new(root).join(&config.project.entry_file);
     if !architecture_md_path.exists() {