Route Pico USB as a differential pair - #94
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What changed
Why
The Pico-style RP2040 circuit previously routed USB D+ and D- as unrelated traces. Keeping the series resistors adjacent and declaring the MCU-side traces as a differential pair preserves the intended USB routing constraint while retaining automatic routing.
Validation
bun run buildpassesgit diff --checkpassesKnown behavior
The snapshot CLI currently logs a length-matcher post-processing error at the 0.3 mm setting even though the preview produces the requested meander. This PR is opened as a draft so that behavior can be reviewed before merge.