Measured on real pi (1e6 digits): first-occurrence position of a k-digit string
~10^k, so the offset needs ~k digits — same size as the data, slope 1. BBP gives
pi free random access (never store the tape) but the address still carries all
the bits. Closes the findings doc on the cleanest single proof of the
base-conversion law. Adds scripts/compression/pi_tape_lut.py.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
