feat(iace): Phase 5 — Betriebszustand-UI + E2E Tests

- GET /operational-states endpoint (9 States + 20 Transitions)
- Frontend: Operational States page with state cards, transitions graph, delta preview
- Navigation: Betriebszustaende entry between Grenzen and Normenrecherche
- E2E: 60+ new Phase 5 tests (operational states, hazards, mitigations, classification)
- E2E: Updated expected counts for expanded libraries (476 measures, 1114 patterns)

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

ai-compliance-sdk/internal/api/handlers/iace_handler_opstates.go

@@ -0,0 +1,41 @@
+package handlers
+
+import (
+	"net/http"
+
+	"github.com/breakpilot/ai-compliance-sdk/internal/iace"
+	"github.com/gin-gonic/gin"
+)
+
+// ListOperationalStates handles GET /operational-states
+// Returns the 9 machine operational states with DE/EN labels and
+// the 20 standard state transitions (directed edges of the state graph).
+func (h *IACEHandler) ListOperationalStates(c *gin.Context) {
+	type stateInfo struct {
+		ID      string `json:"id"`
+		LabelDE string `json:"label_de"`
+		LabelEN string `json:"label_en"`
+		Sort    int    `json:"sort_order"`
+	}
+
+	labels := []stateInfo{
+		{ID: "startup", LabelDE: "Hochfahren", LabelEN: "Startup", Sort: 1},
+		{ID: "homing", LabelDE: "Referenzfahrt", LabelEN: "Homing", Sort: 2},
+		{ID: "automatic_operation", LabelDE: "Automatikbetrieb", LabelEN: "Automatic Operation", Sort: 3},
+		{ID: "manual_operation", LabelDE: "Handbetrieb", LabelEN: "Manual Operation", Sort: 4},
+		{ID: "teach_mode", LabelDE: "Einrichtbetrieb", LabelEN: "Teach Mode", Sort: 5},
+		{ID: "maintenance", LabelDE: "Wartung", LabelEN: "Maintenance", Sort: 6},
+		{ID: "cleaning", LabelDE: "Reinigung", LabelEN: "Cleaning", Sort: 7},
+		{ID: "emergency_stop", LabelDE: "Not-Halt", LabelEN: "Emergency Stop", Sort: 8},
+		{ID: "recovery_mode", LabelDE: "Wiederanlauf", LabelEN: "Recovery Mode", Sort: 9},
+	}
+
+	transitions := iace.StandardStateTransitions()
+
+	c.JSON(http.StatusOK, gin.H{
+		"operational_states": labels,
+		"transitions":       transitions,
+		"total_states":      len(labels),
+		"total_transitions": len(transitions),
+	})
+}