feat: add checkViaPadClearance DRC check#146
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Implements a new placement check that detects when a via's copper annular ring is too close to a pad on a different electrical net. Uses the same circle/polygon distance helpers as existing checks, defaults to JLCPCB min_trace_to_pad_edge_clearance, and is wired into runAllPlacementChecks / the package index. Includes 4 unit tests covering violation, clean, same-net, and no-via cases.
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Summary
Implements
checkViaPadClearance— a new placement DRC check that detects when a via's copper annular ring is too close to a pad on a different electrical net. This addresses issue #44.lib/check-via-pad-clearance.tsusing the same distance helpers from@tscircuit/circuit-json-utilthat other checks usemin_trace_to_pad_edge_clearance; respects board-level DRC overridesrunAllPlacementChecks()and exported from the package indexTest plan
bun test tests/lib/check-via-pad-clearance.test.ts— 4 pass, 0 fail