The May-built OSHA distance library (minimum_distances.go, 29 CFR 1910,
US public domain) was dead code — zero callers, no route, no test, while
the mm values that actually appear in measures are independent hand-prose
(some carrying ISO 13854/13857 values, not OSHA).
This surfaces it without touching the measures response contract:
- GET /iace/minimum-distances (+ ?measure_id=) returns the distances, the
curated measure→distance link table and the licensing note.
- AllMeasureDistanceLinks/MinimumDistancesForMeasure resolve only the
defensible links (M600 value_source; M254/M065 public-domain crossref to
ISO), with the relation made explicit so the join stays honest.
- architecture.go lists the OSHA library so it shows in the audit explainer.
- Tests: inch→mm conversion + license completeness, link integrity, and a
consistency test pinning that a value_source measure's prose still
matches the OSHA source (codifies the audit finding as a regression gate).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Verbatim OSHA 29 CFR 1910 Subpart O values anchored as the rechtssicher
zitierbare Werte-Basis for the IACE engine. Per strategy discussion
(2026-05-20) US Federal Code is the only public-domain corpus we can
reproduce wholesale; DIN/EN values stay identifier-only.
Coverage in this initial batch:
- MD_OSHA_O10_R1, MD_OSHA_O10_R4 (Table O-10 rows 1 + 4 — point of
operation guard distance vs max opening width)
- MD_OSHA_212_FAN (§1910.212(a)(5) fan-blade guards: 1/2 in)
- MD_OSHA_217_PSDI (§1910.217 hand-speed constant 63 in/s for
presence-sensing-device-initiation and two-hand-trip distances)
Each entry carries four parallel value sets:
- OriginalValue/Min/Max in source unit (verbatim, R1)
- ExactMM via deterministic conversion (mathematics, no copyright)
- RecommendedMM with safe-side rounding documented in RoundingNote
- EUNormHints — identifier-only references to EN ISO 13857, EN 13855,
EN 349 with a human-curated DINComparisonNote (qualitative judgement,
not a copy)
Open follow-ups (separate iterations):
- Full Table O-10 (rows 2-10) — same shape
- §1910.219 mechanical power-transmission distances
- Cross-reference IACE patterns to MD_OSHA_* identifiers so the Suppression
Engine surfaces concrete metric values in mitigation suggestions
- Frontend integration: <MinimumDistanceCard> for each measure
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