feat(iace): add hazard-matching-engine with component library, tag system, and pattern engine

Implements Phases 1-4 of the IACE Hazard-Matching-Engine:
- 120 machine components (C001-C120) in 11 categories
- 20 energy sources (EN01-EN20)
- ~85 tag taxonomy across 5 domains
- 44 hazard patterns with AND/NOT matching logic
- Pattern engine with tag resolution and confidence scoring
- 8 new API endpoints (component-library, energy-sources, tags, patterns, match/apply)
- Completeness gate G09 for pattern matching
- 320 tests passing (36 new)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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

@@ -135,6 +135,23 @@ func buildGateDefinitions() []GateDefinition {
 			},
 		},
 
+		// =====================================================================
+		// Pattern Matching Gate (G09) - Recommended
+		// =====================================================================
+		{
+			ID:          "G09",
+			Category:    "onboarding",
+			Label:       "Pattern matching performed",
+			Required:    false,
+			Recommended: true,
+			CheckFunc: func(ctx *CompletenessContext) bool {
+				// Check audit trail for pattern_matching entries
+				// Since we can't query audit trail from context, check if hazards
+				// have been created (proxy for pattern matching having been performed)
+				return len(ctx.Hazards) >= 3
+			},
+		},
+
 		// =====================================================================
 		// Classification Gates (G10-G13) - Required
 		// =====================================================================