Extends ADR-0164's incremental comprehension reader from single-committed
state to held-hypothesis state, adding lookback re-evaluation and in-loop
contemplation. Diagnoses why the ADR-0164 reader is wired but inert
(all-or-nothing refusal at first unknown token / unexpected category).
Architecture: apply_word produces ProblemReadingState.open_hypotheses
(small ranked set, HYPOTHESIS_CAP=4 initial). Three operators per token:
EMIT (extend compatible hypotheses), ELIMINATE (constraint violations
remove hypotheses immediately), HOLD (uncommitted hypotheses survive at
lower confidence). At finalize(), |survivors|=0 refuses, |survivors|=1
admits, |survivors|>=2 invokes in-loop contemplate() over vault + packs
+ audit history. Ambiguity contemplation cannot resolve refuses cleanly,
preserving wrong=0.
Collapses three parallel parsing systems into one held-hypothesis
reader: removes regex parser runtime path (math_parser.py),
per-category injector dispatch table (recognizer_anchor_inject._INJECTORS),
and duplicate per-sentence-choices scaffolding. Net ~1,900 lines
removed; reader grows by ~600 for hypothesis state + reevaluate +
contemplate.
Preserves ADR-0164 lexicon and category set, ADR-0165 regex scope,
ADR-0150/0152/0155/0161 HITL corridor, binding graph + solver
substrate, capability-axis lanes, replay-equivalence gate. Trust
boundary for in-loop contemplation: read-only over vault/packs/audit;
ratification still rides offline HITL.
Status: Proposed. Six phases (no timelines) gated on wrong=0 and
capability-axis 100% at each transition. Five open questions resolved
before Phase 1 PR.
