The PIM Readout Instrument: A Two-Channel Design for the Fifth-Coordinate Fix

Design paper of the Complete Build (Time Machine Blueprints, master list item 111): the navigation organ's readout instrument — a two-channel design for the fifth-coordinate fix (passive spin-ensemble integration of the scar phase; active drive-phase counting), re-referenced by holonomy checkpoints, with a published-instrument noise budget against the simulated sigma_chi requirement of 0.0667 rad (SIMULATED, NOT MEASURED), a sampling design that discharges the sub-pi aliasing condition without sampling the winding, and a pre-registered terrestrial bench. Successor to the PIM error budget, item 107.