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Shay
a13df6f370 feat: ADR-0119.8 — gsm8k_math overall lane gate (gsm8k_capability_shape)
Phase 5.8 of ADR-0119. Composes the per-sub-phase substrate
(5.1..5.6) into a single per-split lane verdict the eventual
ADR-0120 expert promotion contract can consume.

LANE_SHAPE_REGISTRY adds:
  "gsm8k_math": "gsm8k_capability_shape"

_check_gsm8k_capability_shape refuses on any of:
  - missing cases_total / correct / wrong / refused fields
  - cases_total <= 0
  - wrong != 0                          (ADR-0114a Obligation #4)
  - correct + refused != cases_total    (accounting incomplete)
  - overall_pass present and false

Accepts otherwise. Edge: all-refused passes the shape gate (runner
self-consistency). Capability bar (min correct-rate, depth-curve
ε) lives in ADR-0120.

Live measurement on main:
  dev    50/50 correct, 0 wrong, 0 refused  → gate ✓
  public 150/150 correct, 0 wrong, 0 refused → gate ✓

21 invariant tests pin: registry mapping, shape checker presence,
live runner passes, nonzero wrong refuses, incomplete accounting
refuses, missing field refuses, clean metrics pass, all-refused
edge passes, all Phase 5.1..5.6 substrate artifacts exist on disk.

Phase 5 status: 5.1..5.6 + 5.8 ✓. Only 5.7 (sealed real GSM8K
test) remains before ADR-0120 (first expert promotion contract)
becomes feasible.

ADR-0114a roll-up unchanged: 10/10 obligations discharged on main
(modulo Phase 5.7's lane-specific GSM8K test sealing).

Tests: 21 new + 80 prior across Phase 5 + adjacent suites = 101
green; 67/67 smoke.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-05-22 19:45:44 -07:00