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/stdout-writer/tests/stdout_writer_tests.rs

@@ -0,0 +1,12 @@
+use archlens_domain::{RenderOutput, RenderedFile, ports::OutputWriter};
+use archlens_stdout_writer::StdoutOutputWriter;
+
+#[test]
+fn writes_without_error() {
+    let writer = StdoutOutputWriter::new();
+    let file = RenderedFile::new("arch.mmd", "classDiagram").unwrap();
+    let output = RenderOutput::single(file);
+
+    let result = writer.write(&output);
+    assert!(result.is_ok());
+}