feat: implement SPDIP footprint (SPDIP-28)#703
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Add spdip as a footprint function for skinny/shrink plastic DIP packages: 0.3in (7.62mm) row width at high pin counts, 2.54mm pitch, 0.8mm holes, 1.6mm pads. SPDIP-28 matches KiCad's DIP-28_W7.62mm. - src/fn/spdip.ts: spdip function and spdip_def (reuses dip) - footprinter string support: spdip28 and hyphenated SPDIP-28 alias - snapshot tests + KiCad parity test vs DIP-28_W7.62mm (courtyard IoU 99.84%, pads fully overlap)
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Closes #180
Summary
Implements the SPDIP (Skinny/Shrink Plastic Dual In-line Package) footprint — a narrow through-hole DIP that keeps the 0.3in / 7.62mm row width even at high pin counts.
spdipreuses the existingdipgenerator with its standard defaults (2.54mm pitch, 0.8mm holes, 1.6mm pads, rectangular pin-1 pad), which matches KiCad'sDIP-28_W7.62mmexactly.Supported strings:
spdip28/spdip<N>SPDIP-28(hyphenated alias, normalized likeSOT-223-5)spdip28_w7.62mm_p2.54mmVerification
tests/kicad-parity/spdip28_kicad_parity.test.ts) comparesspdip28againstPackage_DIP.pretty/DIP-28_W7.62mm: courtyard IoU 99.84% and pads fully overlap (boolean-difference snapshot).tests/spdip.test.ts.bun test→ 437 pass / 0 fail.bun run buildsucceeds.Note: this PR was prepared with assistance from an AI coding agent; dimensions were verified against the KiCad footprint library reference.