Third rung of the CMB ladder. Reads explicit combined-rate prose into a canonical
CombinedRateProblem or a closed reader refusal; graded by the CMB-a ruler + CMB-b solver via a new
run_reader lane. Off-serving; no router/contemplation/serving/ledger. Claim: 'English prose reads
into a canonical CMB setup or a closed reader refusal.'
Enforces the CMB-a 2x2 domain-entry grid + the deferral taxonomy (rate_unit_mismatch,
combine_mode_ambiguous, missing_second_rate, three_or_more_rates, reciprocal_work_rate_deferred,
clock_interval_deferred, not_combined_rate_shaped). Non-positive-net / non-integer stay the SOLVER's
refusals (the reader parses them). Router-organ hygiene: foreign R1/R2/R3 text steps aside as
not_combined_rate_shaped (the input_shape family), never a substantive boundary (0 breaches on all
36 R1/R2/R3 gold).
THREE adversarial verification rounds found 11 real wrong=0/hygiene hazards a curated-gold lane
cannot surface; all fixed + regression-tested. Root-cause fixes (not point-patches):
- cues are whole-word; difference = a CLEAN fill-vs-drain OPPOSITION classified per rate clause by
the verb in its own lead-in; rate_a=fill/rate_b=drain BY ROLE (a drain listed first still
subtracts); incidental drain nouns / drain-verbs-between-clauses no longer flip the mode;
- query duration + time-query quantity are read only from AFTER the 'how many' question, so neither
a premise number nor a transitional time marker is mistaken for them;
- the rate regex rejects decimals; substantive refusals are gated behind a real combination cue;
combine_mode_ambiguous requires a genuine COMBINED query (a compared pair steps aside);
- sequential segments (each rate carrying its own duration, tolerant of 'also for') step aside.
reader lane 11/0/0 + 7 refused-correct; gold 18/18; 19+17+3 adversarial triggers across 3 rounds;
126 tests (CMB + router/hygiene + R1/R2/R3 readers); serving + siblings unchanged.
Next (ladder): CMB-d router/contemplation wiring -> CMB-e ledger.
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