feat(dsms): Stufe 2+3 — Evidence/TechFile → DSMS + Version Chains + Audit Timeline

Stufe 2A: Evidence Upload → automatische DSMS-Archivierung
- Nach SHA-256 Hash → archive_to_dsms(), CID im Audit-Trail
- Evidence mit CID wird automatisch zu E2 (hash-verifiziert) hochgestuft

Stufe 2B: IACE Tech-File Export → DSMS
- PDF/Excel/DOCX/Markdown Exporte werden nach DSMS archiviert
- archiveTechFile() Helper fuer alle 4 Formate

Stufe 3A: DSMS Gateway — parent_cid + History Endpoint
- parent_cid + tenant_id Felder in DocumentMetadata
- GET /documents/{cid}/history — folgt parent_cid-Chain (max 50 deep)

Stufe 3C: Audit Timeline UI
- Neue Seite /sdk/audit-timeline
- Vertikale Timeline mit farbigen Action-Dots
- Filter: Alle, Nachweis, DSMS-Archiv, Control, Dokument, DSFA, VVT, TOM
- CID-Badges fuer DSMS-archivierte Eintraege

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

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

@@ -5,6 +5,7 @@ import (
 	"net/http"
 	"strings"
 
+	"github.com/breakpilot/ai-compliance-sdk/internal/dsms"
 	"github.com/breakpilot/ai-compliance-sdk/internal/iace"
 	"github.com/breakpilot/ai-compliance-sdk/internal/rbac"
 	"github.com/gin-gonic/gin"
@@ -411,6 +412,7 @@ func (h *IACEHandler) ExportTechFile(c *gin.Context) {
 			c.JSON(http.StatusInternalServerError, gin.H{"error": fmt.Sprintf("PDF export failed: %v", err)})
 			return
 		}
+		archiveTechFile(data, fmt.Sprintf("CE-Akte-%s.pdf", safeName), projectID.String())
 		c.Header("Content-Disposition", fmt.Sprintf(`attachment; filename="CE-Akte-%s.pdf"`, safeName))
 		c.Data(http.StatusOK, "application/pdf", data)
 
@@ -420,6 +422,7 @@ func (h *IACEHandler) ExportTechFile(c *gin.Context) {
 			c.JSON(http.StatusInternalServerError, gin.H{"error": fmt.Sprintf("Excel export failed: %v", err)})
 			return
 		}
+		archiveTechFile(data, fmt.Sprintf("CE-Akte-%s.xlsx", safeName), projectID.String())
 		c.Header("Content-Disposition", fmt.Sprintf(`attachment; filename="CE-Akte-%s.xlsx"`, safeName))
 		c.Data(http.StatusOK, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", data)
 
@@ -429,6 +432,7 @@ func (h *IACEHandler) ExportTechFile(c *gin.Context) {
 			c.JSON(http.StatusInternalServerError, gin.H{"error": fmt.Sprintf("DOCX export failed: %v", err)})
 			return
 		}
+		archiveTechFile(data, fmt.Sprintf("CE-Akte-%s.docx", safeName), projectID.String())
 		c.Header("Content-Disposition", fmt.Sprintf(`attachment; filename="CE-Akte-%s.docx"`, safeName))
 		c.Data(http.StatusOK, "application/vnd.openxmlformats-officedocument.wordprocessingml.document", data)
 
@@ -438,6 +442,7 @@ func (h *IACEHandler) ExportTechFile(c *gin.Context) {
 			c.JSON(http.StatusInternalServerError, gin.H{"error": fmt.Sprintf("Markdown export failed: %v", err)})
 			return
 		}
+		archiveTechFile(data, fmt.Sprintf("CE-Akte-%s.md", safeName), projectID.String())
 		c.Header("Content-Disposition", fmt.Sprintf(`attachment; filename="CE-Akte-%s.md"`, safeName))
 		c.Data(http.StatusOK, "text/markdown", data)
 
@@ -462,3 +467,8 @@ func (h *IACEHandler) ExportTechFile(c *gin.Context) {
 		})
 	}
 }
+
+// archiveTechFile stores a tech-file export to DSMS (best-effort, non-blocking).
+func archiveTechFile(data []byte, filename, projectID string) {
+	dsms.Archive(data, filename, "ce_techfile", projectID, "1")
+}