Balanced pairing: reproducibility packet

This packet records an ATTACK research note, not a Publication. It proves a native normal-index bridge and, using the explicitly credited GHHR boundary-inversion identity, the vanishing of the balanced filled-vacuum pairing in the all-plus sector. It does not prove that the actual vacuum is zero.

Read FPRD-balanced-pairing-vanishing-2026-09-08.md for the argument and hostile-audit.md for its exact limits. source-ledger.md distinguishes formal dependencies from influence on an approach. Primary source texts are not redistributed here.

Reproduce the standard-library verification and archive with:

python build-release.py

The verifier can also test the parity support of one supplied root-row matrix:

python verify-balanced-pairing.py --parity input.json

The JSON input has rows (the actual root row list) and target (the desired root parity). This performs linear elimination over the two-element field, not a topological search. It does not recognize triangulations, check every exact character phase, or prove the external GHHR theorems.

The release includes the proposed continuation handoff FPRD-research-loop-state.md. The mathematical next step is a detector outside the exhausted same-complete-character family.