Add BOM output, fix LTspice Tier 2 import, real .asc integration tests

- Fix _try_ltspice_generation() to use spicelib.simulators.ltspice_simulator.LTspice
  instead of the abstract Simulator base class (which always returned unavailable)
- Use LTspice.create_netlist() instead of Simulator.run() for correct netlist generation
- Add --ltspice-exe CLI option to specify LTspice binary path
- Add --bom flag for component BOM CSV output (works on any parse completeness)
- Add --bom-wiring flag for wiring BOM CSV from mapped output
- Add real 1002A.asc demo circuit and pre-generated .net as test fixtures
- Add @pytest.mark.ltspice marker for tests requiring LTspice binary
- Bump version to 2026.2.14

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "spice2wireviz"
-version = "2026.2.13"
+version = "2026.2.14"
 description = "Convert LTspice SPICE netlists to WireViz wiring diagrams"
 authors = [{name = "Ryan Malloy", email = "ryan@supported.systems"}]
 requires-python = ">=3.11"
@@ -52,3 +52,4 @@ select = ["E", "F", "I", "W", "UP", "B", "SIM", "RUF"]
 
 [tool.pytest.ini_options]
 testpaths = ["tests"]
+markers = ["ltspice: requires LTspice binary installed locally"]