feat: auto-detect project name from pyproject.toml or directory basename

On init, detect project name by:
1. Parsing pyproject.toml [project] name field
2. Falling back to directory basename
Replace <PROJECT_NAME> placeholder in ARCHITECTURE.md template.

archdoc-cli/src/commands/init.rs

@@ -1,9 +1,48 @@
 use anyhow::Result;
 use colored::Colorize;
 
+/// Detect project name from pyproject.toml or directory basename.
+fn detect_project_name(root: &str) -> String {
+    let root_path = std::path::Path::new(root);
+
+    // Try pyproject.toml
+    let pyproject_path = root_path.join("pyproject.toml");
+    if let Ok(content) = std::fs::read_to_string(&pyproject_path) {
+        let mut in_project = false;
+        for line in content.lines() {
+            let trimmed = line.trim();
+            if trimmed == "[project]" {
+                in_project = true;
+                continue;
+            }
+            if trimmed.starts_with('[') {
+                in_project = false;
+                continue;
+            }
+            if in_project && trimmed.starts_with("name") {
+                if let Some(val) = trimmed.split('=').nth(1) {
+                    let name = val.trim().trim_matches('"').trim_matches('\'');
+                    if !name.is_empty() {
+                        return name.to_string();
+                    }
+                }
+            }
+        }
+    }
+
+    // Fallback: directory basename
+    root_path
+        .canonicalize()
+        .ok()
+        .and_then(|p| p.file_name().map(|n| n.to_string_lossy().to_string()))
+        .unwrap_or_else(|| "Project".to_string())
+}
+
 pub fn init_project(root: &str, out: &str) -> Result<()> {
     println!("{}", "Initializing archdoc project...".cyan().bold());
 
+    let project_name = detect_project_name(root);
+
     let out_path = std::path::Path::new(out);
     std::fs::create_dir_all(out_path)?;
     std::fs::create_dir_all(out_path.join("modules"))?;
@@ -95,8 +134,10 @@ pub fn init_project(root: &str, out: &str) -> Result<()> {
 <!-- MANUAL:END -->
 "#;
 
+    let architecture_md_content = architecture_md_content.replace("<PROJECT_NAME>", &project_name);
+
     let architecture_md_path = std::path::Path::new(root).join("ARCHITECTURE.md");
-    std::fs::write(&architecture_md_path, architecture_md_content)?;
+    std::fs::write(&architecture_md_path, &architecture_md_content)?;
 
     let config_toml_content = r#"[project]
 root = "."