init: archlens — architecture diagram generator

Hex arch + DDD, tree-sitter parsing, Mermaid/ASCII output.
Supports Rust + Python. 92 tests. CI, diff, --check for staleness detection.

crates/domain/tests/module_name_tests.rs

@@ -0,0 +1,23 @@
+use archlens_domain::ModuleName;
+
+#[test]
+fn valid_module_name_is_created() {
+    let name = ModuleName::new("Orders").unwrap();
+    assert_eq!(name.as_str(), "Orders");
+}
+
+#[test]
+fn empty_module_name_is_rejected() {
+    let result = ModuleName::new("");
+    assert!(result.is_err());
+}
+
+#[test]
+fn module_names_are_comparable() {
+    let a = ModuleName::new("Orders").unwrap();
+    let b = ModuleName::new("Orders").unwrap();
+    let c = ModuleName::new("Billing").unwrap();
+
+    assert_eq!(a, b);
+    assert_ne!(a, c);
+}