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/analysis_result_tests.rs

@@ -0,0 +1,39 @@
+use archlens_domain::{
+    AnalysisResult, AnalysisWarning, CodeElement, CodeElementKind, FilePath, Relationship,
+    RelationshipKind,
+};
+
+#[test]
+fn analysis_result_collects_elements_relationships_and_warnings() {
+    let element = CodeElement::new(
+        "Order",
+        CodeElementKind::Struct,
+        FilePath::new("src/order.rs").unwrap(),
+        1,
+    )
+    .unwrap();
+
+    let relationship =
+        Relationship::new("OrderService", "Order", RelationshipKind::Composition).unwrap();
+
+    let warning = AnalysisWarning::new(
+        FilePath::new("src/broken.rs").unwrap(),
+        10,
+        "unparseable macro",
+    )
+    .unwrap();
+
+    let result = AnalysisResult::new(vec![element], vec![relationship], vec![warning]);
+
+    assert_eq!(result.elements().len(), 1);
+    assert_eq!(result.relationships().len(), 1);
+    assert_eq!(result.warnings().len(), 1);
+}
+
+#[test]
+fn empty_analysis_result() {
+    let result = AnalysisResult::empty();
+    assert!(result.elements().is_empty());
+    assert!(result.relationships().is_empty());
+    assert!(result.warnings().is_empty());
+}