Phase B round 2. Categorizing the post-#304 GSM8K train_sample's
still-refused 47 set surfaced three coherent sub-shapes in the previously
UNCATEGORIZED tail plus five ratified-but-narrowness-blocked temporal
cases; this PR ships the operator-authored exemplar seeds + Phase A
categorizer extension that prove the corridor scales beyond round 1.
Exemplar corpora (70 new exemplars across 4 files):
- discrete_count_statement_v1.jsonl (20)
- multiplicative_aggregation_v1.jsonl (20)
- currency_amount_v1.jsonl (20)
- temporal_aggregation_v2.jsonl (10, widening)
Each corpus carries ≥3 verbatim train-sample citations, ≥12 (≥5 for v2)
novel operator-authored statements, and ≥1–3 edge cases. Statements are
disjoint across all 7 round-1 + round-2 corpora; tests enforce.
Phase A categorizer (evals/refusal_taxonomy/shape_categories.py)
extends ShapeCategory with three new members and inserts their rule
predicates AFTER the existing more-specific categories:
- rate_with_currency before currency_amount
- multiplicative_aggregation before discrete_count_statement
Each new rule predicate cites ≥3 train_sample case_ids in its docstring
(ADR-0163 §Risks). No LLM, no embedding, no learned classifier.
Refusal-taxonomy histogram empirical signal (public 50 sample):
- pre-round-2: 14 UNCATEGORIZED (categorized_rate 0.72)
- post-round-2: 1 UNCATEGORIZED (categorized_rate 0.98)
The single residual is case 0044 ("10% simple interest" — percentage
without change verb), an honest tail outside the three round-2 shapes.
wrong=0 holds on capability axes G1..G5 + S1; no runtime code shipped.
Smoke suite green (67/67).
Cross-refs: ADR-0163, #297 (Phase A), #298 (Phase B round 1),
#301 (Phase C), #302 (Phase D), #304 (round-1 ratify), #305 (session
recap).
Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>
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