Reproduce lost pin electrical types on real Altium schematics

[Abse2001]

Summary

• Adds semantic pin-type checks to the existing pinned open-source Altium schematic round trips.
• Uses the complete HERON systems_pcb.SchDoc, where six native output pins and two native power pins become passive after Circuit JSON is converted back to Altium.
• Keeps the full circuit in the test; there is no focused or synthetic pin fixture.
• Extends the full-board snapshot with source-versus-round-trip pin-type bars so the loss is visible.

Stack

1. This PR: real-circuit repro only; it asserts the current loss.
2. Preserve real schematic pin electrical types #73: fix only, based on this branch.

Verification

• Five pinned open-source schematic round trips pass.
• bun run format:check
• bun run typecheck

View the full-circuit repro snapshot