fix(iace): coarser block grouping by category+component only

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

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

@@ -2,7 +2,6 @@ package iace
 
 import (
 	"sort"
-	"strings"
 
 	"github.com/google/uuid"
 )
@@ -108,22 +107,10 @@ func ComputeHazardBlocks(
 }
 
 func buildBlockKey(h Hazard) string {
-	comp := h.ComponentID.String()
-	zone := NormalizeDEPublic(h.HazardousZone)
-	// Use first 3 significant words of zone for grouping
-	words := strings.Fields(zone)
-	var sig []string
-	for _, w := range words {
-		w = strings.Trim(w, ".,;:!?()/-")
-		if len(w) >= 4 {
-			sig = append(sig, w)
-		}
-		if len(sig) >= 2 {
-			break
-		}
-	}
-	zoneKey := strings.Join(sig, "_")
-	return h.Category + ":" + comp + ":" + zoneKey
+	// Group by category + component. Hazards at the same component in the
+	// same category form one block — the zone is typically different but the
+	// protective measures (e.g. Schutzzaun, Sicherheitszuhaltung) are shared.
+	return h.Category + ":" + h.ComponentID.String()
 }
 
 func sortByRiskDesc(entries []HazardBlockEntry, assessMap map[uuid.UUID]*RiskAssessment) {