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/adapters/ascii/tests/ascii_renderer_tests.rs

@@ -0,0 +1,48 @@
+use archlens_ascii::AsciiRenderer;
+use archlens_domain::{
+    CodeElement, CodeElementKind, CodeGraph, FilePath, Relationship, RelationshipKind,
+    ports::DiagramRenderer,
+};
+
+#[test]
+fn renders_elements_and_relationships_as_text() {
+    let mut graph = CodeGraph::new();
+    graph.add_element(
+        CodeElement::new(
+            "OrderService",
+            CodeElementKind::Class,
+            FilePath::new("src/service.rs").unwrap(),
+            1,
+        )
+        .unwrap(),
+    );
+    graph.add_element(
+        CodeElement::new(
+            "Order",
+            CodeElementKind::Struct,
+            FilePath::new("src/order.rs").unwrap(),
+            1,
+        )
+        .unwrap(),
+    );
+    graph.add_relationship(
+        Relationship::new("OrderService", "Order", RelationshipKind::Composition).unwrap(),
+    );
+
+    let renderer = AsciiRenderer::new();
+    let output = renderer.render(&graph).unwrap();
+    let content = output.files()[0].content();
+
+    assert!(content.contains("OrderService"));
+    assert!(content.contains("Order"));
+    assert!(content.contains("has"));
+}
+
+#[test]
+fn empty_graph_produces_header_only() {
+    let renderer = AsciiRenderer::new();
+    let output = renderer.render(&CodeGraph::new()).unwrap();
+    let content = output.files()[0].content();
+
+    assert!(content.contains("Architecture"));
+}