feat(ADR-0136.S.2): conditional-op question — gsm8k-0042 admits, wrong==0 (#203)
Adds CandidateConditionalOpQuestion + extractor for the closed shape:
"If <Entity> <verb> <N> <unit>, how many <unit2> does <Entity2> <aux> [<qualifier>]?"
In parse_and_solve, when the question yields exactly one such candidate
and exactly one matching InitialPossession exists by (entity, unit) across
all statement sentences, computes initial_value ± operand (verb polarity)
and emits when answer >= 0; refuses otherwise. Structurally identical to
S.1 capacity/earnings short-circuits.
GSM8K probe: 2/50 → 3/50 (+0042, answer=30.0), wrong stays 0.
- generate/math_candidate_parser.py: _COND_SUBTRACT_VERBS / _COND_ADD_VERBS
closed sets; _COND_OP_Q_RE; extract_conditional_op_question_candidates
- generate/math_candidate_graph.py: short-circuit after earnings path
- tests/test_adr_0136_S2_conditional_op.py: 25 tests (extractor unit tests,
end-to-end short-circuit, B3 + S.1 regression guards, post-S.2 honest
admission count)
- docs/decisions/ADR-0136.S.2-conditional-op-question.md
e7a1ffb72e