Tightens the multi_sentence_response lane predicates so OOV
invitations and refusal disclosures can no longer be counted as
articulate capability. Three new metrics partition the case space:
articulate_sentence_rate - >=2 sentences AND grounded in
{pack, teaching}. Real capability.
disclosure_sentence_rate - >=2 sentences AND grounded in
{oov, refusal, none}. Structural
multi-sentence from disclosure templates.
unarticulate_rate - <2 sentences regardless of source.
The three sum to 1.0 (modulo rounding) by construction. The
doctrine-correct headline is now ``articulate_sentence_rate``;
``multi_sentence_rate`` is kept as a continuity metric only.
2 new tests pin: (a) the three-way partition is total and disjoint
(articulate + disclosure + unarticulate == 1.0); (b) OOV/refusal
disclosure surfaces contribute to disclosure_sentence_rate but
never to articulate_sentence_rate.
Live A/B on 21 cases under the new partition:
flag off: articulate=0.0952, disclosure=0.0476, unarticulate=0.8571
flag on : articulate=0.8571, disclosure=0.0476, unarticulate=0.0952
Planner lift is +76pp on articulate. Disclosure stays flat across
the flag (the planner gate correctly leaves disclosure surfaces
alone). The remaining 9.5pp unarticulate flag-on is the genuine
miss list (walkthrough + compound prompts) that the next two
landings will target.
contract.md updated to make articulate_sentence_rate the headline
and to document the partition explicitly.
cognition eval byte-identical: public 100/100/91.7/100.
smoke suite 67/67.
07fefb923c