Review a board layout

DRC passing means the copper obeys the rules. This skill asks whether the layout serves the circuit, which no rule checks. The output is a findings table for the user; it changes nothing. Fixes are made afterwards with kicad-placement, kicad-routing and kicad-board-edit, once the user has chosen them.

Before

• Rules first: run kicad-check and leave its findings to it.
• Design notes: read DESIGN.md (or CLAUDE.md, AGENTS.md). A finding the user already accepted there is reported as "expected", not as new.
• Layout sections: collect the layout guidance from the datasheet of every regulator, crystal or oscillator, interface IC and connector that has one. Those are the main requirements of this review.
• Fast nets: list them from the schematic: clocks, crystal pins, SPI/SWD, USB and other differential pairs, switch nodes, and anything the datasheets call sensitive.

Measuring