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/fixtures/1002A.asc

@@ -0,0 +1,96 @@
+Version 4
+SHEET 1 896 680
+WIRE -256 64 -256 48
+WIRE -128 64 -128 48
+WIRE 288 64 128 64
+WIRE 400 64 368 64
+WIRE 432 64 400 64
+WIRE 544 64 512 64
+WIRE 32 112 16 112
+WIRE 128 112 128 64
+WIRE 128 112 112 112
+WIRE 160 112 128 112
+WIRE 272 112 240 112
+WIRE -256 160 -256 144
+WIRE -128 160 -128 144
+WIRE 192 208 192 192
+WIRE 128 224 128 112
+WIRE 160 224 128 224
+WIRE 448 224 448 208
+WIRE 272 240 272 112
+WIRE 272 240 224 240
+WIRE 304 240 272 240
+WIRE 400 240 400 64
+WIRE 400 240 384 240
+WIRE 416 240 400 240
+WIRE 64 256 -96 256
+WIRE 160 256 64 256
+WIRE 544 256 544 64
+WIRE 544 256 480 256
+WIRE 592 256 544 256
+WIRE -96 272 -96 256
+WIRE 416 272 400 272
+WIRE 192 288 192 272
+WIRE 448 304 448 288
+WIRE -96 384 -96 352
+WIRE 160 384 -96 384
+WIRE 400 384 400 272
+WIRE 400 384 160 384
+WIRE -96 400 -96 384
+WIRE -96 496 -96 480
+FLAG -128 160 0
+FLAG 192 192 +V
+FLAG -128 48 +V
+FLAG 192 288 -V
+FLAG -256 160 0
+FLAG -256 48 -V
+FLAG 16 112 0
+FLAG -96 496 0
+FLAG 448 208 +V
+FLAG 448 304 -V
+FLAG 64 256 IN-
+FLAG 160 384 IN+
+FLAG 592 256 OUT
+SYMBOL voltage -128 48 R0
+SYMATTR InstName V1
+SYMATTR Value 15
+SYMBOL voltage -256 48 R0
+SYMATTR InstName V2
+SYMATTR Value -15
+SYMBOL res 256 96 R90
+WINDOW 0 0 56 VBottom 2
+WINDOW 3 32 56 VTop 2
+SYMATTR InstName R1
+SYMATTR Value 10K
+SYMBOL res 128 96 R90
+WINDOW 0 0 56 VBottom 2
+WINDOW 3 32 56 VTop 2
+SYMATTR InstName R2
+SYMATTR Value 100K
+SYMBOL voltage -96 256 R0
+SYMATTR InstName V3
+SYMATTR Value SINE(0 1m 100)
+SYMBOL res 384 48 R90
+WINDOW 0 0 56 VBottom 2
+WINDOW 3 32 56 VTop 2
+SYMATTR InstName R3
+SYMATTR Value 2.2K
+SYMBOL res 400 224 R90
+WINDOW 0 0 56 VBottom 2
+WINDOW 3 32 56 VTop 2
+SYMATTR InstName R4
+SYMATTR Value 10K
+SYMBOL res 528 48 R90
+WINDOW 0 0 56 VBottom 2
+WINDOW 3 32 56 VTop 2
+SYMATTR InstName R5
+SYMATTR Value 100K
+SYMBOL voltage -96 384 R0
+SYMATTR InstName V4
+SYMATTR Value SINE(0 1 10)
+SYMBOL opamps\\LT1002A 192 176 R0
+SYMATTR InstName U1
+SYMBOL opamps\\LT1002A 448 192 R0
+SYMATTR InstName U2
+TEXT 440 392 Left 2 !.tran 300m
+TEXT -48 -16 Left 2 ;Two Op Amp Instrumentation Amplifier

tests/fixtures/1002A.net

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+* Z:\tmp\1002A.asc
+* Generated by LTspice 26.0.1 for Windows.
+V1 +V 0 15
+V2 -V 0 -15
+R1 N003 N001 10K
+R2 N001 0 100K
+V3 IN- IN+ SINE(0 1m 100)
+R3 N002 N001 2.2K
+R4 N002 N003 10K
+R5 OUT N002 100K
+V4 IN+ 0 SINE(0 1 10)
+X§U1 IN- N001 +V -V N003 LT1001 ;§pnba In+)In-)V+)V-)OUT
+X§U2 IN+ N002 +V -V OUT LT1001 ;§pnba In+)In-)V+)V-)OUT
+.tran 300m
+* Two Op Amp Instrumentation Amplifier
+* Library below included based on ModelFile attribute of instance X§U1, X§U2 (C:\users\rpm\AppData\Local\LTspice\lib\sym\OpAmps\LT1002A.asy)
+.lib LTC.lib
+.backanno
+.end