feat: implement all P1/P2/P3/P4 improvements from issue backlog

P1 correctness:
- filter test files by default (--include-tests to opt in)
- per-module diagrams show cross-module dependency arrows
- qualified type names (Module::TypeName) fix false edges from duplicate names

P2 output richness:
- method parameter types and return types in class diagrams (Rust + Python)
- Python pyproject.toml project analyzer (--level project for monorepos)

P3 unique value:
- boundary rules in archlens.toml ([rules] allow/deny, --strict enforcement)

P4 nice to have:
- dependency weight labels on module arrows (--no-weights to disable)
- --watch mode with 500ms debounce
- D2 renderer adapter (--format d2)
- interactive self-contained HTML viewer (--format html)
- git-aware incremental analysis (--since <ref>)

crates/adapters/tree-sitter/tests/rust_analyzer_tests.rs

@@ -128,3 +128,145 @@ fn extracts_mod_declarations() {
     assert!(imports.iter().any(|r| r.target() == "crate::models"));
     assert!(imports.iter().any(|r| r.target() == "crate::services"));
 }
+
+#[test]
+fn extracts_rust_method_with_typed_params() {
+    let source = r#"
+pub struct OrderService;
+impl OrderService {
+    pub fn process(&self, order: Order, count: u64) {}
+}
+"#;
+    let result = analyze_rust(source, "service.rs");
+
+    let element = result
+        .elements()
+        .iter()
+        .find(|e| e.name() == "OrderService")
+        .unwrap();
+
+    assert!(
+        element
+            .methods()
+            .iter()
+            .any(|m| m.contains("order: Order") && m.contains("count: u64")),
+        "expected typed params in method, got: {:?}",
+        element.methods()
+    );
+}
+
+#[test]
+fn extracts_rust_method_return_type() {
+    let source = r#"
+pub struct OrderService;
+impl OrderService {
+    pub fn get(&self) -> Order {}
+}
+"#;
+    let result = analyze_rust(source, "service.rs");
+
+    let element = result
+        .elements()
+        .iter()
+        .find(|e| e.name() == "OrderService")
+        .unwrap();
+
+    assert!(
+        element.methods().iter().any(|m| m.contains("-> Order")),
+        "expected return type in method, got: {:?}",
+        element.methods()
+    );
+}
+
+#[test]
+fn extracts_rust_method_params_and_return() {
+    let source = r#"
+pub struct OrderService;
+impl OrderService {
+    pub fn process(&self, order: Order) -> Result<(), Error> {}
+}
+"#;
+    let result = analyze_rust(source, "service.rs");
+
+    let element = result
+        .elements()
+        .iter()
+        .find(|e| e.name() == "OrderService")
+        .unwrap();
+
+    let method = element
+        .methods()
+        .iter()
+        .find(|m| m.contains("process"))
+        .unwrap();
+    assert!(method.contains("order: Order"), "missing param: {method}");
+    assert!(method.contains("->"), "missing return arrow: {method}");
+}
+
+#[test]
+fn extracts_rust_static_method_params() {
+    let source = r#"
+pub struct Finder;
+impl Finder {
+    pub fn detect(path: &str, count: usize) -> bool { false }
+}
+"#;
+    let result = analyze_rust(source, "finder.rs");
+    let element = result
+        .elements()
+        .iter()
+        .find(|e| e.name() == "Finder")
+        .unwrap();
+    let method = element
+        .methods()
+        .iter()
+        .find(|m| m.contains("detect"))
+        .unwrap();
+    assert!(method.contains("path"), "missing path param: {method}");
+    assert!(method.contains("count"), "missing count param: {method}");
+}
+
+#[test]
+fn extracts_rust_private_method_params() {
+    let source = r#"
+pub struct WalkdirDiscovery;
+impl WalkdirDiscovery {
+    fn detect_language(path: &std::path::Path) -> Option<String> { None }
+}
+"#;
+    let result = analyze_rust(source, "discovery.rs");
+    let element = result
+        .elements()
+        .iter()
+        .find(|e| e.name() == "WalkdirDiscovery")
+        .unwrap();
+    let method = element
+        .methods()
+        .iter()
+        .find(|m| m.contains("detect_language"))
+        .unwrap();
+    assert!(method.contains("path"), "missing path param: {method}");
+}
+
+#[test]
+fn extracts_rust_method_reference_param() {
+    let source = r#"
+use std::path::Path;
+pub struct WalkdirDiscovery;
+impl WalkdirDiscovery {
+    fn detect_language(path: &Path) -> Option<String> { None }
+}
+"#;
+    let result = analyze_rust(source, "discovery.rs");
+    let element = result
+        .elements()
+        .iter()
+        .find(|e| e.name() == "WalkdirDiscovery")
+        .unwrap();
+    let method = element
+        .methods()
+        .iter()
+        .find(|m| m.contains("detect_language"))
+        .unwrap();
+    assert!(method.contains("path"), "missing path param: {method}");
+}