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e2d2b21551
PADS_BANK0 GPIO5 had PDE (pull-down enable, bit 2) still set to its reset default. With both PUE and PDE active the pin floated to ~VDD/2, causing the Schmitt trigger to read LOW permanently. Clear PDE in _configure_pad() so the pull-up works correctly. Added PADS_BANK0_PDE_SHIFT define to rp2350.h.