Two-level state model for the incremental comprehension reader:
ProblemReadingState (outer, problem-scoped) carries the entity registry,
accumulated initial possessions, accumulated operations, the unknown
target slot, and the pronoun resolution history. SentenceReadingState
(inner, sentence-scoped) carries the current frame, expectation,
pending quantities, pending entity reference, pending verb, lookback
window, and the partial frame payload under construction.
Lifecycle API (signatures only): begin_sentence, apply_word,
end_sentence. All three pure / deterministic / no I/O. apply_word
reads from problem_state for pronoun resolution per ADR-0164.2 but
does not mutate it; only end_sentence produces a new
ProblemReadingState that folds in the just-closed sentence's
contribution.
Closed READER_REFUSAL_REASONS vocabulary across three lifetime
groupings (token-level, sentence-level, problem-level), mirroring
ADR-0134's admissibility-reason discipline.
Canonical-bytes serialization for both state levels matches existing
trace_hash and MathProblemGraph.canonical_bytes discipline.
Sorted-keys JSON, compact separators, Decimal-as-string for
precision, optional-None fields omitted.
Worked example: gsm8k-train-sample-v1-0001. Sentence 1 ("Tina makes
$18.00 an hour.") admits as a rate apply_rate operation; sentences 2
and 3 refuse at the leading "If" with unexpected_category
(conditional_frame is Phase-1 out-of-scope). The example demonstrates
the state model — that even when the reader refuses, the state at
the moment of refusal is what makes the refusal honest, typed, and
file-able as a teaching candidate.
Termination predicate is_terminable + finalize specified pure: a
ProblemReadingState becomes a strict ADR-0115 MathProblemGraph only
when entity registry is non-empty, unknown_target_slot is bound,
every accumulated op/initial references a known entity, and every
partial payload projects losslessly into the strict types.
Naming reconciliation: ADR-0164's sketched ComprehensionState is the
inner level under this ADR (SentenceReadingState). Brief 5 will
produce both types.
No code. ADR doc only.
Refs ADR-0164 §Open question #4.
20f3a5d586