diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index cae8f53..c36bdad 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -5,6 +5,7 @@ on:
     branches: [main, develop, 'feature/**', 'release/**', 'hotfix/**']
   pull_request:
     branches: [main, develop]
+  workflow_dispatch:
 
 permissions:
   contents: read
@@ -42,16 +43,21 @@ jobs:
       - name: Git-Staging-Filter Regressionstest
         run: npm run verify:git-staging
 
+      - name: Release-Manifest und Paketvertrag prüfen
+        run: npm run verify:release-manifest
+
       - name: Git-Ignore-Grenzen für Quell- und Runtimeordner prüfen
         run: npm run verify:ignore-boundaries
 
       - name: Syntaxprüfung
         run: npm run check
 
-
       - name: PowerShell-Regressionen statisch prüfen
         run: npm run verify:powershell-static
 
+      - name: Updater-3.4-Lifecycle und Startkette prüfen
+        run: npm run verify:updater-start-chain && npm run verify:updater-lifecycle
+
       - name: Produktiven Source-Root und Archivgrenzen prüfen
         run: npm run verify:source-boundaries
 
@@ -146,3 +152,69 @@ jobs:
         shell: pwsh
         run: npm run verify:all
 
+  package-after-acceptance:
+    name: Updater-3.4-Paket nach Abnahme
+    needs: [quality, windows-release-contract]
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    steps:
+      - name: Exakten geprüften Head auschecken
+        uses: actions/checkout@v6
+        with:
+          ref: ${{ github.event.pull_request.head.sha || github.sha }}
+          fetch-depth: 0
+
+      - name: Node.js 22 aktivieren
+        uses: actions/setup-node@v4
+        with:
+          node-version: '22.x'
+          cache: npm
+
+      - name: Abhängigkeiten reproduzierbar installieren
+        run: npm ci
+
+      - name: main für den Provenienzvergleich aktualisieren
+        run: git fetch origin main:refs/remotes/origin/main
+
+      - name: Reproduzierbares Root-Manifest bestätigen
+        shell: bash
+        run: |
+          node tools/generate-release-manifest.mjs .
+          git diff --exit-code -- release-manifest.json
+
+      - name: Paket mit unveränderlicher Provenienz erzeugen
+        env:
+          VENDOO_SOURCE_COMMIT: ${{ github.event.pull_request.head.sha || github.sha }}
+        run: node tools/build-release.mjs
+
+      - name: Paketmanifest und SHA-256 prüfen
+        shell: bash
+        run: |
+          set -euo pipefail
+          release_name="$(tr -d '\r\n' < release-output/RELEASE_NAME.txt)"
+          package_dir="release-output/${release_name}"
+          node --input-type=module - "$package_dir" <<'NODE'
+          import { readAndValidateManifest } from './tools/release-manifest-lib.mjs';
+          const packageDir = process.argv[2];
+          const manifest = readAndValidateManifest(packageDir);
+          if (manifest.schema !== 'vendoo-release-package-v2') throw new Error(`Unerwartetes Paketschema: ${manifest.schema}`);
+          if (manifest.updaterVersion !== '3.4.0') throw new Error(`Unerwartete Updater-Version: ${manifest.updaterVersion}`);
+          if (manifest.targetVersion !== '1.43.0') throw new Error(`Unerwartete Zielversion: ${manifest.targetVersion}`);
+          console.log(`Paket validiert: ${manifest.targetVersion}, Updater ${manifest.updaterVersion}, Payload ${manifest.payloadHash}`);
+          NODE
+          (
+            cd release-output
+            zip -qr "${release_name}.zip" "${release_name}"
+            sha256sum "${release_name}.zip" > "${release_name}.zip.sha256"
+            sha256sum --check "${release_name}.zip.sha256"
+          )
+
+      - name: Abgenommenes Paket als CI-Artefakt bereitstellen
+        uses: actions/upload-artifact@v4
+        with:
+          name: vendoo-1.43.0-updater-3.4-${{ github.event.pull_request.head.sha || github.sha }}
+          path: |
+            release-output/*.zip
+            release-output/*.zip.sha256
+          if-no-files-found: error
+          retention-days: 14