Add USB-C mid-mount 16-pin footprinter#708
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Summary
usbcmidmount16footprinter for both merged 12-land and split 16-land USB-C receptaclesWhy
The TYPE_C_16PIN_2MD_073_ footprint imported in common#78 combines unequal-width signal pads, plated shell slots, and non-plated locator holes. Other common JLCPCB USB-C receptacles vary materially: some expose all 16 contacts, some merge duplicate contacts into 12 lands, some omit locator holes, and shell-tab geometry differs by board-sink depth.
Covered JLCPCB parts
The target copper primitives were imported from JLCPCB/EasyEDA using
tsci import --jlcpcb <part number>.usbcmidmount16_pinstart13usbcmidmount16_noholes_powerx3.21mm_powerpw0.6mm_rowy2.386mm_ph1mm_shellx5.6mm_topy1.164mm_bottomy2.836mm_tophh1.4mm_topring0.3mm_bottomhh1.8mm_bodybottom4.876mmusbcmidmount16_split_reverse_noholes_pinstart25_rowy2.325mm_shellx5.62mm_topy1.175mm_bottomy2.825mm_tophh1.3mm_topring0.2mm_bottomhh1.7mm_bottomring0.2mm_bodybottom4.925mmusbcmidmount16_split_pinstart1_rowy2.115mm_ph1.3mm_shellx4.32mm_topy1.465mm_bottomy2.715mm_tophh1.6mm_topring0.2mm_bottomhh1.4mm_bottomring0.2mm_holey0.935mm_bodybottom5.38mmusbcmidmount16_reverse_pinstart13_rowy2.161mm_ph1.3mm_powerpw0.6mm_shellx4.32mm_topy1.419mm_bottomy2.761mm_tophw0.7mm_tophh1.7mm_topring0.25mm_bottomhw0.7mm_bottomhh1.3mm_bottomring0.25mm_holey0.919mm_bodybottom5.4mmImpact
Imported mid-mount USB-C footprints can now be represented by reusable physical parameters instead of inline TSX copper. Locator holes remain mechanical holes rather than zero-annulus plated copper.
Validation
bun test tests/usbcmidmount.test.ts— 6 pass, 0 fail; all five copper IoUs above 99.99%bun test— 439 pass, 0 failbun run buildgit diff --check