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>)

Cargo.toml

@@ -12,6 +12,9 @@ members = [
     "crates/adapters/stdout-writer",
     "crates/adapters/toml-config",
     "crates/adapters/cargo-workspace",
+    "crates/adapters/python-project",
+    "crates/adapters/d2",
+    "crates/adapters/html-viewer",
 ]
 
 [workspace.dependencies]
@@ -26,6 +29,10 @@ archlens-file-writer = { path = "crates/adapters/file-writer" }
 archlens-stdout-writer = { path = "crates/adapters/stdout-writer" }
 archlens-toml-config = { path = "crates/adapters/toml-config" }
 archlens-cargo-workspace = { path = "crates/adapters/cargo-workspace" }
+archlens-python-project = { path = "crates/adapters/python-project" }
+archlens-d2 = { path = "crates/adapters/d2" }
+archlens-html = { path = "crates/adapters/html-viewer" }
+serde_json = "1"
 
 # Error handling
 thiserror = "2"
@@ -55,5 +62,8 @@ tracing-subscriber = { version = "0.3", features = ["env-filter"] }
 # Parallelism
 rayon = "1"
 
+# File watching
+notify = { version = "7", features = ["serde"] }
+
 # Testing
 tempfile = "3"