Bound QQ16 private d_A retention at the B1 cut

[1337isnot1337]

Result

This is a scoped negative result for one proposed QQ16 interface mechanism: retaining the post-B_1_2 eight-coordinate d_A = Y_A observation in the existing owned fields C0..C7.

At the exact pinned cut, the private fields return in frame I, while the eight A-port Y outputs have frames f117, f124, f137, f144, f153, f163, f174, f228, each with 18 nonzero Z4 terms. An exact scan of all 3,650 registered cover maps finds no one-map normalization to I. In the one-term native-line model, matching the eight private fields to the source frames requires at least 144 rank-one line calls, with 288 associated full-cover map operations. The eight coefficient-one scalar copies cost 32 real scalar primitives. Terminal cleanup adds eight clear primitives; a following retained core can reuse its existing clears.

The current favorable rank-eight output envelope in Discussion #2074 leaves at most two further rank-one-equivalent calls above the selected ceiling. The 144-line floor exceeds that planning allowance before charging the record handling, physical address/stream costs, global hosting, or recursive precision. This is scoped to the pinned single-map search and one-term line conversion model; it does not rule out a multi-map route or another state layout. No controller or new κ is claimed.

Reproduction and evidence

python3 -I -B research/qq16-private-da-frame-floor-seed81b017/verify.py
python3 -I -O -B research/qq16-private-da-frame-floor-seed81b017/test_package.py
python3 -B scripts/research_package.py --package research/qq16-private-da-frame-floor-seed81b017 --check-only

The first two commands pass locally on CPython 3.14.7. Package metadata and source pins pass. This environment has no CPython 3.12 executable, so I could not run the registered Python 3.12 replay locally; no hosted CI result is claimed here.

The package pins base 0fdd7d82de03e43c9e5a1000dfbcd380d1b687d2, selected record SHA-256 10b9e340fd8e354a37a0c4813c90e5de1dd42044b5f6aca4a3fc5a42b685fa32, and the QQ16 certificate SHA-256 a5ed85fac5ebf3c091482a113ab0d351eb5a7892fe2841a35e16017ec1ff49f7. The positive controls check the identity map and one-term cancellation; negative controls reject a wrong stage, wrong port, and mutated source certificate.

Relation to prior work

Merged PR #1969 supplies the retained QQ16 words and native wrapper conventions. PR #2174 (f79470a7931f3943360c10d15b428e0e4e479c22) supplies the conditional two-query decoder and identifies realization of d_A at the B1 cut as open. This contribution tests one concrete private-bank relay mechanism. It is separate from the pre-F0 ordinary-to-selected B2 X_U observation claimed in Discussion #2074.

Claim and handoff: Discussion #2192. Substantial OpenAI Codex assistance was used; no independent human review is claimed.