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6 supplementary measures (M410-M420) were silently overwritten by metalworking duplicates in measureByID lookups, so robot-cell electrical patterns resolved to chip-extraction/cleaning fallbacks instead of equipotential bonding, creepage, EMC, or hose-burst protection. Rename supplementary IDs to M475-M480 and rewire 13 affected pattern references in robot_cell + robot_cell_ext. HP1640 (direct contact with live parts, GT 2.2): priority 98->99, drop RequiredEnergyTags gate so it fires in robot cells without an electrical tag, expand mitigations to 5 concrete TRBS 2131 / IEC 60204-1 / EN 61140 measures (basic protection, double insulation, earthing, insulation monitoring, equipotential bonding) — was previously losing to HP1688 even though HP1688 describes a different scenario. HP1688 (touch voltage from potential differences): priority 98->96 so it no longer outranks HP1640 for the direct-contact case; mitigations expanded from M410-only to 4 concrete electrical measures. Add regression tests pinning HP1640 contact-protection resolution and M475 = Potentialausgleich. Existing TestGetProtectiveMeasureLibrary_- UniqueIDs now actually enforces uniqueness (previously masked by last-wins map override). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>