feat(iace): 25 new robot cell patterns (HP1650-HP1697) + matcher fix

New patterns from GT benchmark gap analysis:
- HP1650-1655: Robot arm motion limit, restart safety, tool/workpiece
  crushing, workpiece penetrates fence, reaching over fence
- HP1660-1661: Centering gripper crushing (outside/inside cell)
- HP1665-1666: Machine tool loading door, machining workspace
- HP1670-1671: Coolant splash eyes, compressed air injury
- HP1675: Coolant hose burst/detachment
- HP1680: Workpiece/tunnel crushing at conveyor
- HP1685-1689: Indirect contact, cabinet contact, liquid ingress fire,
  potential differences, RCD socket protection
- HP1690-1691: Ergonomic loading/control position
- HP1695: Burns from hot workpieces
- HP1697: Machine collapse through floor

Matcher: keyword overlap penalty — matches without shared hazard-type
keywords AND low zone score get 0.5x penalty to prevent false matches.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ai-compliance-sdk/internal/iace/pattern_registry.go

@@ -38,5 +38,6 @@ func collectAllPatterns() []HazardPattern {
 	patterns = append(patterns, GetVDMAIndustryPatterns()...)         // HP1500-HP1549 VDMA sectors (Phase 3)
 	patterns = append(patterns, GetTextileAgriPatterns()...)          // HP1550-HP1584 Textile + Agri (Phase 5)
 	patterns = append(patterns, GetRobotCellPatterns()...)            // HP1600-HP1649 Robot cell (GT benchmark)
+	patterns = append(patterns, GetRobotCellPatternsExt()...)        // HP1650-HP1699 Robot cell extended (GT gaps)
 	return patterns
 }