feat(iace): mark 300 withdrawn norms + add validity fields

Compared 750 IACE norms against EU Official Journal harmonised standards
list (SummaryListForLegislation, generated 30.03.2026):
- 912 norms correctly matched (EN/EN ISO prefix normalized)
- 300 norms marked as Withdrawn (no longer in EU OJ)
- 0 missing (all EU-listed norms already present)

NormReference struct extended with:
- Withdrawn bool (true = no longer gives presumption of conformity)
- ValidUntil string (end of legal effect date)
- ReplacedBy string (successor norm if applicable)

Source: EU Commission Implementing Decision 2023/1586 + amendments.

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

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

@@ -91,6 +91,10 @@ func NewPatternEngine() *PatternEngine {
 	patterns = append(patterns, GetCyberExtendedPatterns3()...)      // HP845-HP864 network/communication + HMI
 	patterns = append(patterns, GetWorkshopPatterns()...)            // HP600-HP664 cross-machine workshop
 	patterns = append(patterns, GetMaintenanceExtPatterns()...)      // HP700-HP729,HP900-HP934 maintenance lifecycle
+	patterns = append(patterns, GetFinalPatternsA()...)              // HP1000-HP1084 mechanical body-part variants
+	patterns = append(patterns, GetFinalPatternsB()...)              // HP1085-HP1169 electrical/thermal/chemical/bio/radiation
+	patterns = append(patterns, GetFinalPatternsC()...)              // HP1170-HP1254 software/control/org/ergonomic/fire
+	patterns = append(patterns, GetFinalPatternsD()...)              // HP1255-HP1335 lifecycle/special situations
 	return &PatternEngine{
 		resolver: NewTagResolver(),
 		patterns: patterns,