feat(iace): Klaerungen Phase 2 — Sidebar-Counter + CSV-Export + Hazard-Banner

Three pieces complete the Klaerungen UX:

1. Sidebar-Counter: layout.tsx polls /clarifications and shows a
   colored open-count badge on the "Klaerungen" nav item. Refreshes
   whenever the user changes route.

2. CSV-Export: new backend endpoint
   GET /sdk/v1/iace/projects/:id/clarifications.csv produces a UTF-8-
   BOM-prefixed semicolon-separated CSV (Excel-friendly) with ID,
   Quelle, Kategorie, Frage, Status, Antwort, Begruendung, Bearbeiter,
   answered_at, anzahl Gefaehrdungen, Gefaehrdungs-Namen, Norm-Refs.
   Frontend Klaerungen-Seite bekommt einen "CSV-Export"-Button.

3. Hazard-Banner statt Fragentext im Benchmark-Detail: the previous
   bulleted clarification list was duplicated across 48 hazards for a
   single FANUC question. Phase 2 replaces it with a compact status
   badge — "N offene Klaerung(en) — Klaerungen-Seite oeffnen" (orange)
   or "Alle N Klaerungen beantwortet" (green) with a direct link.

Backend cleanup: iace_handler_init.go no longer appends the "Mit
Anlagenbauer zu klaeren" block to Hazard.Description. The description
stays focused on the scenario; clarifications live in the dedicated
endpoint and answers persist across re-inits via project.metadata.
The aggregated "Referenzierte Normen" line on the hazard is kept.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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

@@ -1,9 +1,12 @@
 package handlers
 
 import (
+	"encoding/csv"
 	"encoding/json"
+	"fmt"
 	"net/http"
 	"sort"
+	"strings"
 	"time"
 
 	"github.com/breakpilot/ai-compliance-sdk/internal/iace"
@@ -216,3 +219,64 @@ func (h *IACEHandler) AnswerClarification(c *gin.Context) {
 		"answer":           answers[cid],
 	})
 }
+
+// ExportClarificationsCSV handles GET /projects/:id/clarifications.csv.
+// Returns the aggregated clarifications as a CSV for handover to the
+// Anlagenbauer — one row per question with all referenced hazards and
+// the current answer state.
+func (h *IACEHandler) ExportClarificationsCSV(c *gin.Context) {
+	projectID, err := uuid.Parse(c.Param("id"))
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid project ID"})
+		return
+	}
+	ctx := c.Request.Context()
+	project, err := h.store.GetProject(ctx, projectID)
+	if err != nil || project == nil {
+		c.JSON(http.StatusNotFound, gin.H{"error": "project not found"})
+		return
+	}
+	hazards, _ := h.store.ListHazards(ctx, projectID)
+	answers, _ := readClarificationAnswers(project.Metadata)
+	narrative := extractNarrativeFromMetadata(project.Metadata)
+	hazardToPatterns := h.reconstructHazardPatterns(narrative, project.MachineType, hazards)
+	manufHits := iace.LookupManufacturerFeaturesInText(narrative)
+	clarifications := iace.BuildProjectClarifications(hazards, hazardToPatterns, manufHits, answers)
+
+	sort.Slice(clarifications, func(i, j int) bool {
+		if clarifications[i].Status != clarifications[j].Status {
+			return clarifications[i].Status == "open"
+		}
+		return clarifications[i].Source < clarifications[j].Source
+	})
+
+	filename := fmt.Sprintf("klaerungen_%s_%s.csv", project.MachineName, time.Now().Format("2006-01-02"))
+	filename = strings.ReplaceAll(filename, " ", "_")
+	c.Header("Content-Type", "text/csv; charset=utf-8")
+	c.Header("Content-Disposition", `attachment; filename="`+filename+`"`)
+	// Excel-Erkennung: UTF-8 BOM voranstellen
+	c.Writer.Write([]byte{0xEF, 0xBB, 0xBF})
+	w := csv.NewWriter(c.Writer)
+	w.Comma = ';'
+	_ = w.Write([]string{
+		"ID", "Quelle", "Kategorie", "Frage", "Status", "Antwort", "Begruendung",
+		"Bearbeiter", "Beantwortet_am", "Anzahl_Gefaehrdungen", "Gefaehrdungen", "Norm_Referenzen",
+	})
+	for _, cl := range clarifications {
+		_ = w.Write([]string{
+			cl.ID,
+			cl.Source,
+			cl.Category,
+			cl.Question,
+			cl.Status,
+			cl.Answer,
+			cl.Reasoning,
+			cl.AnsweredBy,
+			cl.AnsweredAt,
+			fmt.Sprintf("%d", len(cl.AffectedHazardIDs)),
+			strings.Join(cl.AffectedHazardNames, " | "),
+			strings.Join(cl.NormReferences, " | "),
+		})
+	}
+	w.Flush()
+}