docs(adr-0179): scope extraction richness — the prerequisite that unblocks coverage (#446)
The recurring wall every recent measurement hit: the structure machinery (MS-3,
GB-1, GB-2) is built but STARVED by thin extraction. extract.py's digit+single-word
regex loses word-numbers ('three'), multi-word units ('jumping jacks'), currency/
decimals, sentence-final numbers, and mis-attributes units ('36 on Tuesday'->'on',
which blocks GB-2 same-unit list-sum on 0024).
Two layers, very different risk:
(A) sealed derivation extractor (extract.py) — safe to enrich (over-extraction is
caught by the gate's completeness+grounding+uniqueness; refuse-preferring). Bulk
lives here.
(B) shared grounding primitive (_value_grounds/_tokens) — wrong=0-sensitive (serving
round-trip uses it). EXACTLY ONE change: bare-decimal grounding ('N.M' grounds when
digit-runs N,M appear — symmetric with existing .NN/N/M logic), wrong=0-gated by
serving 3/47/0 byte-identical (lane-SHA gate). _value_grounds already handles /bin/zsh.75
but the extractor strips the $ -> bare 0.75 fails; that's the 0003 gap.
Reuses en_numerics_v1 + WORD_NUMBERS (word-numbers) + existing currency/fraction/
compound grounding (ADR-0128/0131.G.3) — extends, never reinvents. Lexeme-level
(ADR-0165). Sub-phases EX-1 word-numbers, EX-2 currency/decimal + grounding fix,
EX-3 multi-word units, EX-4 list-unit inheritance (unblocks 0024), EX-5 sentence-
final, EX-6 measure.
Honest payoff: unblocks BUILT capability — uniform units -> GB-2 list-sum fires
(0024); decimals -> MS-3 product flips (0003); word-numbers -> comparatives resolve;
new gold-matching chains -> feed cue-precision (0177's bottleneck). Flip-curve
should finally move on extraction-blocked cases; op-ambiguity + scale still gate the
rest. wrong=0 obligations: serving byte-identical after the grounding fix; over-
extraction refuse-preferring; determinism.
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