Add 7 new graphical schematic templates (differential amp, buck converter,
LDO regulator, H-bridge, common emitter, Colpitts oscillator) and rewrite
inverting amp to actually include an op-amp instead of just passive components.
Fix UniversalOpamp2 subcircuit error: the .asy symbol defines SpiceModel as
"level2", so SYMATTR Value must be omitted to let the built-in model name
resolve. Previously emitting SYMATTR Value UniversalOpamp2 caused LTspice
to search for a non-existent subcircuit.
Fix wire-through-pin routing bugs: vertical wires crossing intermediate
opamp/source pins auto-connect at those pins, creating unintended shorts.
Rerouted V1-to-In+ paths to avoid crossing In- pins in non-inverting,
common-emitter, Colpitts, and differential amp templates.
Refactor generate_schematic tool from hardcoded if/elif to registry dispatch
via _ASC_TEMPLATES dict, matching the _TEMPLATES pattern for netlists.
All 10 templates verified: simulate with zero errors and zero NC nodes.
255 tests pass, source lint clean.
Ryan Malloy
c56ce918b4