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/toml-config/tests/toml_config_tests.rs

@@ -0,0 +1,68 @@
+use std::fs;
+
+use archlens_domain::{DiagramLevel, ports::ConfigLoader};
+use archlens_toml_config::TomlConfigLoader;
+
+#[test]
+fn loads_analysis_config_from_toml_file() {
+    let dir = tempfile::tempdir().unwrap();
+    let config_path = dir.path().join("archlens.toml");
+    fs::write(
+        &config_path,
+        r#"
+[analysis]
+exclude = ["tests/", "vendor/"]
+level = "type"
+
+[modules]
+"src/orders" = "Orders"
+"src/billing" = "Billing"
+"#,
+    )
+    .unwrap();
+
+    let loader = TomlConfigLoader::from_path(&config_path).unwrap();
+    let config = loader.load_analysis_config().unwrap();
+
+    assert_eq!(config.excludes(), &["tests/", "vendor/"]);
+    assert_eq!(config.level(), DiagramLevel::Type);
+    assert_eq!(
+        config.module_mappings().get("src/orders").unwrap(),
+        "Orders"
+    );
+}
+
+#[test]
+fn loads_output_config_from_toml_file() {
+    let dir = tempfile::tempdir().unwrap();
+    let config_path = dir.path().join("archlens.toml");
+    fs::write(
+        &config_path,
+        r#"
+[output]
+format = "mermaid"
+path = "docs/arch.mmd"
+split_by_module = true
+"#,
+    )
+    .unwrap();
+
+    let loader = TomlConfigLoader::from_path(&config_path).unwrap();
+    let config = loader.load_output_config().unwrap();
+
+    assert!(config.split_by_module());
+    assert_eq!(config.output_path(), Some("docs/arch.mmd"));
+}
+
+#[test]
+fn missing_file_returns_defaults() {
+    let loader = TomlConfigLoader::default();
+
+    let analysis = loader.load_analysis_config().unwrap();
+    assert!(analysis.excludes().is_empty());
+    assert_eq!(analysis.level(), DiagramLevel::Module);
+
+    let output = loader.load_output_config().unwrap();
+    assert!(!output.split_by_module());
+    assert!(output.output_path().is_none());
+}