Review a schematic

This covers the schematic: what each part sees electrically. Where parts sit and how they're connected on the board is kicad-layout-review.

Read the schematic and netlist (kicad-view) and each part's datasheet. Two netlist checks to run first: view.py decoupling (every IC supply pin has a capacitor on its rail) and, if the design notes list key connections as `U2.4 = +3V3` lines, view.py expect board.kicad_sch DESIGN.md. Back anything that depends on a frequency response or transient with kicad-simulate. Give every number with its source. The output is a table the user can check, not a verdict.

1. State the environment