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/presentation/src/cli.rs

@@ -32,6 +32,18 @@ pub struct Cli {
     #[arg(long)]
     pub exclude: Vec<String>,
 
+    #[arg(long)]
+    pub include_tests: bool,
+
+    #[arg(long)]
+    pub no_weights: bool,
+
+    #[arg(long)]
+    pub watch: bool,
+
+    #[arg(long, value_name = "REF")]
+    pub since: Option<String>,
+
     #[arg(long)]
     pub split_by_module: bool,