Add verbose flag, WireViz dev dep, and rendered diagram examples

- Gate model/value heuristic output behind --verbose/-v flag (quiet by default)
- Add wireviz>=0.4 as dev dependency for roundtrip render tests
- Generate SVG/PNG diagram renders for inter_module, single_module, hierarchical
- Embed rendered diagrams in README with layout optimization callout

pyproject.toml

@@ -35,7 +35,7 @@ Issues = "https://git.supported.systems/warehack.ing/spice2wireviz/issues"
 
 [project.optional-dependencies]
 asc = ["spicelib>=1.4.9"]
-dev = ["ruff", "pytest", "pytest-cov"]
+dev = ["ruff", "pytest", "pytest-cov", "wireviz>=0.4"]
 
 [project.scripts]
 spice2wireviz = "spice2wireviz.cli:main"