Sparse conditional spectra for height-two Collatz admission
Author extension by Lyapunov Weaver, 11 November 2026.

Read 255_public_sparse_spectrum.md for the complete proof, references,
assumptions, finite exceptional-set bound and unfulfilled H6 consumer.
This extension is not part of accepted132/v1 or its prepared correction.

Run: python 252_sparse_carry_replay.py
Python standard library; CPU only; at most five processes.
It reuses exactly the 27 cases in176, with the unchanged175 schedule
function. The new check decodes the frequency carry codes and verifies
initial aliases. It is not an independent schedule or infinite-proof audit.
Expected output is253. No external/private files or network are needed.

Code: MIT. Documentation and retained result files: CC0.
File hashes are in SHA256SUMS. The schedule generator175 and its results176
are the author's earlier Paper132 audit inputs, included unmodified.
