Update freeink-sdk
1. X3 wb_gc passive byte (the one-byte 0x54 to 0x00, matching stock's passive WB table in the gc nudge bank) Every X3 grayscale render, reader AA, covers, and the sleep-cover nudge, gets it. 2. X4 blotchy grays on sleep covers: the displayGrayscaleBase(HALF_REFRESH) revert (the gray nudge LUT being calibrated against the HALF pixel state, not FULL's)
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