[ToikY]

Change and scope

NO VERIFIED GAIN. Exact conditional κ change 0%. On exact #7334, test a rank-nine productive split into ranks three and six at the retimed chart-1089 entrance. The paid itinerary stays fixed. All 12 pre-event cuts from 44588 through 44599 are tested for pivot 1081, with the entire public cochart bank and all 615 eligible boundary cohort roles. The exact public bank is [85,319,1081], with no owned rows. The rational exterior prefix has full rank three at every cut. An independent exact nonzero modular minor certifies each rank with unit denominators. Zero cuts remain unresolved. No suffix test or build was needed.

The complete pre-support change would be T3+17, T6+17, T9−17, with P unchanged. Gross one-edit upper 0.3528183420760684 raw at the exact crossing. One added paid rank-one position defeats the complete invoice margin. This chart and partition are distinct from #7339's chart-207 1+8 and #7332's chart-240 family.

Replay

Exact #7334 aaeec8c0acf01e99a5f331ef363a698d9c084ace, κ 0.00364665195644, and exact #7113 07a76c5e2738882c0cb322278e56f6cae3c9885d. With CPython 3.12 from a clean checkout:

python3.12 -I -B research/p104-chart1089-split-bound/replay.py
python3.12 -B scripts/research_package.py --package research/p104-chart1089-split-bound
python3.12 -B scripts/check_research_commit.py --package research/p104-chart1089-split-bound --check-modes --check-source-history

Local complete price, two occupancy and support replays, corrupt-word rejection, committed modes and source checks, and official Git-free export passed. The branch carries #7257's shared planner repair.

Credit and next question

#7334 supplies the literal retimed word, #7113 the signed caller, #7298 the tariff, #7339 the bank/cohort evidence and pairing method, and #7121/#7130 earlier productive splits. OpenAI Codex and subagents materially assisted. A different cut or paid chronology remains open. Pin and price one concrete alternative before testing exact two-sided support.