Wires the turn-program executor into the generalized-lift instrument and
measures it against the REAL GSM8K dev holdout (evals/gsm8k_math/dev, never the
templated cases), using each problem's ground_truth_graph. Baseline is a
symbolic fold of the SAME compiled turn program: both paths consume identical
problems, the corridor relaxes each step, the baseline folds it numerically.
Honest result on the sealed 50-case dev holdout: 26 problems are Tier-1 affine
single-accumulator ingestible and solved wrong=0; the corridor matches the
symbolic fold on every one (PARITY, delta=0) — the field matches arithmetic, it
does not beat it, so this is real-holdout coverage, NOT a manufactured lift. The
24 refused (all not_single_accumulator / multi-entity) are the recorded Tier-2
frontier, never silently dropped.
Corrects the now-stale scope-limitation note ('no reader-to-Hamiltonian compiler
exists…') — the compiler exists as of this arc; the note now records real-data
Tier-1 coverage and the multi-entity frontier. wrong_zero_guard_held extended to
bind both exact-regime domains (deductive flagship + arithmetic).
10/10 pins (5 new + 5 existing instrument tests still green).
[Verification]: uv run python -m pytest tests/test_adr_0249_arithmetic_lift.py tests/test_generalized_lift_instrument.py -q
