Follow-up to PR #398 — lights up the dormant consumption path by
extending _match_rate_with_currency to publish composition_shape +
pre-composed CandidateInitial in parsed_anchors.
Scope: one matcher extension (_match_rate_with_currency) for the
currency-per-unit composition shape ("$X each"). Other composition
shapes (multi-quantity, additive, subtractive) deferred to ME-3/4/5
follow-ups.
Subject binding decision pinned: Option A (refuse when same-sentence
subject is absent). Forbids Option B (placeholder subject —
fabricates attribution). Defers Option C (cross-sentence subject)
to its own ME-2 brief.
Honest consequence: case 0019 stays refused in THIS PR (requires
Option C). Truth-test #1 replaced with a synthetic "Maria bought 3
vet appointments at $400 each" canary that has same-sentence
subject. The flywheel turns one revolution: ratify → compile →
load → consume → admit, end-to-end on the synthetic canary.
Operator profile: Opus (load-bearing wrong=0; pre-composed
CandidateInitial; case 0050 mandatory pin).
Test surface enumerated (4 test files, 12+ tests):
- test_matcher_extension_currency_per_unit (8 narrowness tests)
- test_matcher_extension_case_0050_hazard_pin (mandatory)
- test_matcher_extension_end_to_end_admission (truth test)
- test_matcher_extension_train_sample_baseline_preserved
- test_matcher_extension_public_split_preserved
6-row truth test pinned. Anti-regression invariants enumerated.
Forbidden surface includes Option B + new SAFE category entries +
solver mutation.
Recommended next dispatch sequence: ME-1 → ME-2 (case 0019) →
ME-3/4/5 (remaining composition shapes).
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