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

tests/test_asc.py

@@ -206,8 +206,7 @@ class TestLTspiceGeneration:
         result = parse_asc(asc)
         assert result.completeness == DataCompleteness.METADATA_ONLY
 
-    @patch("spice2wireviz.parser.asc.Simulator", create=True)
-    def test_ltspice_generation_success(self, mock_sim_cls, tmp_path):
+    def test_ltspice_generation_success(self, tmp_path):
         """Mocked LTspice successfully generates a .net file."""
         asc = tmp_path / "test.asc"
         asc.write_text("Version 4\nSHEET 1 880 680\n")
@@ -220,7 +219,7 @@ class TestLTspiceGeneration:
             ".ends gen_mod\n"
         )
 
-        # Mock the import path inside _try_ltspice_generation
+        # Mock the whole Tier 2 function
         with patch(
             "spice2wireviz.parser.asc._try_ltspice_generation"
         ) as mock_tier2:
@@ -279,3 +278,89 @@ class TestCompanionNetlistInternalHelper:
         assert result is not None
         assert result.completeness == DataCompleteness.FULL
         assert result.source_net == net
+
+
+class TestRealAscIntegration:
+    """Integration tests with a real LTspice-generated .asc / .net pair.
+
+    1002A.asc is a two op-amp instrumentation amplifier from the LTspice
+    demo circuit archive. The companion 1002A.net was pre-generated by
+    LTspice so these tests work in CI without LTspice installed.
+    """
+
+    def test_real_asc_companion_resolution(self):
+        """Tier 1: 1002A.asc resolves to companion 1002A.net."""
+        result = parse_asc(FIXTURES / "1002A.asc")
+        assert result.completeness == DataCompleteness.FULL
+        assert result.source_net is not None
+        assert result.source_net.name == "1002A.net"
+
+    def test_real_asc_has_components(self):
+        """The parsed netlist has X* instances (op-amps)."""
+        result = parse_asc(FIXTURES / "1002A.asc")
+        netlist = result.netlist
+        # 1002A.net has X§U1 and X§U2 (LTspice op-amp instances)
+        x_refs = [inst.reference for inst in netlist.instances]
+        assert len(x_refs) >= 2
+        # The § character is part of LTspice's hierarchical naming
+        assert any("U1" in ref for ref in x_refs)
+        assert any("U2" in ref for ref in x_refs)
+
+    def test_real_asc_has_nets(self):
+        """The parsed netlist has known nets from the circuit."""
+        result = parse_asc(FIXTURES / "1002A.asc")
+        netlist = result.netlist
+        assert len(netlist.all_nets) > 0
+        # The circuit uses +V, -V, OUT, IN+, IN- as net names
+        net_names = {n.upper() for n in netlist.all_nets}
+        assert "+V" in net_names or "V+" in net_names or any("V" in n for n in net_names)
+
+    def test_real_asc_no_warnings_on_companion(self):
+        """Companion resolution should produce no warnings."""
+        result = parse_asc(FIXTURES / "1002A.asc")
+        # Warnings are acceptable for enrichment, but not for core parsing
+        # Only check that we didn't get "no companion" warnings
+        for w in result.warnings:
+            assert "no companion" not in w.lower()
+
+    @pytest.mark.ltspice
+    def test_real_asc_ltspice_generation(self, tmp_path):
+        """Tier 2: generate .net from .asc using LTspice binary.
+
+        Requires LTspice installed. Skipped in CI.
+        """
+        import shutil
+
+        ltspice_path = Path("/home/rpm/.local/bin/ltspice")
+        if not ltspice_path.exists():
+            pytest.skip("LTspice binary not found")
+
+        # Copy .asc to temp dir (avoid polluting fixtures)
+        asc_copy = tmp_path / "1002A.asc"
+        shutil.copy2(FIXTURES / "1002A.asc", asc_copy)
+
+        # Remove any existing .net so Tier 2 is forced
+        net_copy = tmp_path / "1002A.net"
+        if net_copy.exists():
+            net_copy.unlink()
+
+        result = parse_asc(
+            asc_copy,
+            allow_ltspice_generation=True,
+            ltspice_exe=str(ltspice_path),
+        )
+        assert result.completeness == DataCompleteness.FULL
+        assert result.source_net is not None
+        assert result.source_net.name == "1002A.net"
+
+    def test_ltspice_exe_nonexistent_path(self, tmp_path):
+        """--ltspice-exe with a bad path falls through to Tier 3."""
+        asc = tmp_path / "test.asc"
+        asc.write_text("Version 4\nSHEET 1 880 680\n")
+
+        result = parse_asc(
+            asc,
+            allow_ltspice_generation=True,
+            ltspice_exe="/nonexistent/ltspice",
+        )
+        assert result.completeness == DataCompleteness.METADATA_ONLY