Identify electrical ports sharing a node with gf.Pin objects

[ThomasPluck]

Context

Upstream task: https://github.com/doplaydo/pdks/issues/45 (Add pins to all PDKs)

For SPICE export to work correctly, we need to identify which electrical ports in this PDK share a node with a gf.Pin object.

Task

Audit all cells in this PDK and identify every electrical port that shares a node with a gf.Pin object. This is a prerequisite for adding proper pin annotations to enable SPICE netlist export.

What to look for

• Cells with electrical ports (e.g. pads, vias, resistors, capacitors, any component with metal routing)
• Which of those ports correspond to the same electrical node as an existing gf.Pin
• Document the mapping of port name → pin association

Reference

See this PR for an example of where this was partially done.