diff --git a/.gitea/workflows/ci.yaml b/.gitea/workflows/ci.yaml
index ab9c9b6f..a4c39796 100644
--- a/.gitea/workflows/ci.yaml
+++ b/.gitea/workflows/ci.yaml
@@ -411,6 +411,50 @@ jobs:
           pip install --quiet --no-cache-dir pytest pytest-asyncio
           python -m pytest test_main.py -v --tb=short
 
+  # ── P83: BUILD_SHA integrity (always) ────────────────────────────────────
+  # Every Dockerfile must declare ARG BUILD_SHA + ENV BUILD_SHA so the
+  # check-rebuild-needed.sh script can detect "old code in container" drift.
+  # Every docker-compose build: block must pass BUILD_SHA through as a build
+  # arg — otherwise the ARG defaults to "unknown" and the check is toothless.
+  build-sha-integrity:
+    runs-on: docker
+    container: alpine:3.20
+    steps:
+      - name: Checkout
+        run: |
+          apk add --no-cache git python3
+          git clone --depth 1 --branch ${GITHUB_REF_NAME} ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}.git .
+      - name: Validate every Dockerfile + compose block declares BUILD_SHA
+        run: |
+          python3 - <<'PY'
+          import re, sys, glob
+          fails = []
+          # 1. Each Dockerfile must have ARG BUILD_SHA + ENV BUILD_SHA=${BUILD_SHA}
+          for df in sorted(glob.glob("*/Dockerfile")):
+              # Skip nested non-canonical Dockerfiles (e.g. admin-compliance/ai-compliance-sdk/Dockerfile)
+              if df.count("/") > 1: continue
+              src = open(df).read()
+              if "ARG BUILD_SHA" not in src:
+                  fails.append(f"{df}: missing ARG BUILD_SHA")
+              if "ENV BUILD_SHA" not in src:
+                  fails.append(f"{df}: missing ENV BUILD_SHA")
+          # 2. Every build: block in docker-compose.yml must pass BUILD_SHA
+          import yaml
+          compose = yaml.safe_load(open("docker-compose.yml"))
+          for name, svc in (compose.get("services") or {}).items():
+              build = svc.get("build")
+              if not isinstance(build, dict):
+                  continue  # skipping pre-built image refs
+              args = (build.get("args") or {})
+              if "BUILD_SHA" not in args:
+                  fails.append(f"docker-compose.yml: service '{name}' build.args missing BUILD_SHA")
+          if fails:
+              print("::error::BUILD_SHA integrity check failed:")
+              for f in fails: print(f"  - {f}")
+              sys.exit(1)
+          print(f"OK: BUILD_SHA wired in all Dockerfiles + compose build blocks.")
+          PY
+
   # ── OpenAPI contract validation (always) ─────────────────────────────────
   validate-canonical-controls:
     runs-on: docker
diff --git a/ai-compliance-sdk/Dockerfile b/ai-compliance-sdk/Dockerfile
index 4e27e624..97a10bce 100644
--- a/ai-compliance-sdk/Dockerfile
+++ b/ai-compliance-sdk/Dockerfile
@@ -38,6 +38,9 @@ RUN adduser -D -u 1000 appuser
 USER appuser
 
 # Expose port
+ARG BUILD_SHA="unknown"
+ENV BUILD_SHA=${BUILD_SHA}
+
 EXPOSE 8090
 
 # Health check
diff --git a/compliance-tts-service/Dockerfile b/compliance-tts-service/Dockerfile
index 76428078..3c566b66 100644
--- a/compliance-tts-service/Dockerfile
+++ b/compliance-tts-service/Dockerfile
@@ -35,6 +35,9 @@ RUN if [ -f /etc/ImageMagick-6/policy.xml ]; then     sed -i "s/rights=\"none\"
 RUN chown -R ttsuser:ttsuser /app
 USER ttsuser
 
+ARG BUILD_SHA="unknown"
+ENV BUILD_SHA=${BUILD_SHA}
+
 EXPOSE 8095
 
 HEALTHCHECK --interval=30s --timeout=10s --start-period=120s --retries=3     CMD curl -sf http://127.0.0.1:8095/health || exit 1
diff --git a/developer-portal/Dockerfile b/developer-portal/Dockerfile
index 2dae055a..0d1c4bc9 100644
--- a/developer-portal/Dockerfile
+++ b/developer-portal/Dockerfile
@@ -39,6 +39,9 @@ COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static
 USER nextjs
 
 # Expose port
+ARG BUILD_SHA="unknown"
+ENV BUILD_SHA=${BUILD_SHA}
+
 EXPOSE 3000
 
 # Set hostname
diff --git a/docker-compose.yml b/docker-compose.yml
index 15a0087f..d2c767c6 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -46,6 +46,7 @@ services:
       args:
         NEXT_PUBLIC_API_URL: ${NEXT_PUBLIC_API_URL:-https://macmini:8002}
         NEXT_PUBLIC_SDK_URL: ${NEXT_PUBLIC_SDK_URL:-https://macmini:8093}
+        BUILD_SHA: ${BUILD_SHA:-unknown}
     container_name: bp-compliance-admin
     platform: linux/arm64
     expose:
@@ -71,6 +72,8 @@ services:
 
   developer-portal:
     build:
+      args:
+        BUILD_SHA: ${BUILD_SHA:-unknown}
       context: ./developer-portal
       dockerfile: Dockerfile
     container_name: bp-compliance-developer-portal
@@ -88,6 +91,8 @@ services:
   # =========================================================
   backend-compliance:
     build:
+      args:
+        BUILD_SHA: ${BUILD_SHA:-unknown}
       context: ./backend-compliance
       dockerfile: Dockerfile
     container_name: bp-compliance-backend
@@ -142,6 +147,8 @@ services:
   # =========================================================
   ai-compliance-sdk:
     build:
+      args:
+        BUILD_SHA: ${BUILD_SHA:-unknown}
       context: ./ai-compliance-sdk
       dockerfile: Dockerfile
     container_name: bp-compliance-ai-sdk
@@ -186,6 +193,8 @@ services:
   # =========================================================
   compliance-tts-service:
     build:
+      args:
+        BUILD_SHA: ${BUILD_SHA:-unknown}
       context: ./compliance-tts-service
       dockerfile: Dockerfile
     container_name: bp-compliance-tts
@@ -215,6 +224,8 @@ services:
   # =========================================================
   dsms-node:
     build:
+      args:
+        BUILD_SHA: ${BUILD_SHA:-unknown}
       context: ./dsms-node
       dockerfile: Dockerfile
     container_name: bp-compliance-dsms-node
@@ -238,6 +249,8 @@ services:
 
   dsms-gateway:
     build:
+      args:
+        BUILD_SHA: ${BUILD_SHA:-unknown}
       context: ./dsms-gateway
       dockerfile: Dockerfile
     container_name: bp-compliance-dsms-gateway
@@ -259,6 +272,8 @@ services:
   # =========================================================
   consent-tester:
     build:
+      args:
+        BUILD_SHA: ${BUILD_SHA:-unknown}
       context: ./consent-tester
       dockerfile: Dockerfile
     container_name: bp-compliance-consent-tester
@@ -293,6 +308,8 @@ services:
 
   document-crawler:
     build:
+      args:
+        BUILD_SHA: ${BUILD_SHA:-unknown}
       context: ./document-crawler
       dockerfile: Dockerfile
     container_name: bp-compliance-document-crawler
@@ -326,6 +343,8 @@ services:
   # =========================================================
   docs:
     build:
+      args:
+        BUILD_SHA: ${BUILD_SHA:-unknown}
       context: .
       dockerfile: docs-src/Dockerfile
     container_name: bp-compliance-docs
diff --git a/docs-site/Dockerfile b/docs-site/Dockerfile
new file mode 100644
index 00000000..9e62e271
--- /dev/null
+++ b/docs-site/Dockerfile
@@ -0,0 +1,51 @@
+# ============================================
+# BreakPilot Compliance Dokumentation - MkDocs Build
+# Multi-stage build fuer minimale Image-Groesse
+# ============================================
+
+# Stage 1: Build MkDocs Site
+FROM python:3.11-slim AS builder
+
+WORKDIR /docs
+
+RUN pip install --no-cache-dir \
+    mkdocs==1.6.1 \
+    mkdocs-material==9.5.47 \
+    pymdown-extensions==10.12
+
+COPY mkdocs.yml /docs/
+COPY docs-src/ /docs/docs-src/
+
+RUN mkdocs build
+
+# Stage 2: Serve with Nginx
+FROM nginx:alpine
+
+COPY --from=builder /docs/docs-site /usr/share/nginx/html
+
+RUN echo 'server { \
+    listen 80; \
+    server_name localhost; \
+    root /usr/share/nginx/html; \
+    index index.html; \
+    location / { \
+        try_files $uri $uri/ /index.html; \
+    } \
+    gzip on; \
+    gzip_types text/plain text/css application/json application/javascript text/xml application/xml; \
+    gzip_min_length 1000; \
+    location ~* \.(css|js|png|jpg|jpeg|gif|ico|svg|woff|woff2)$ { \
+        expires 1y; \
+        add_header Cache-Control "public, immutable"; \
+    } \
+}' > /etc/nginx/conf.d/default.conf
+
+ARG BUILD_SHA="unknown"
+ENV BUILD_SHA=${BUILD_SHA}
+
+EXPOSE 80
+
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
+    CMD wget --no-verbose --tries=1 --spider http://localhost/ || exit 1
+
+CMD ["nginx", "-g", "daemon off;"]
diff --git a/docs-src/Dockerfile b/docs-src/Dockerfile
index 89d44ec0..45ef3f8f 100644
--- a/docs-src/Dockerfile
+++ b/docs-src/Dockerfile
@@ -40,6 +40,9 @@ RUN echo 'server { \
     } \
 }' > /etc/nginx/conf.d/default.conf
 
+ARG BUILD_SHA="unknown"
+ENV BUILD_SHA=${BUILD_SHA}
+
 EXPOSE 80
 
 HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
diff --git a/document-crawler/Dockerfile b/document-crawler/Dockerfile
index 7a25e578..8d0ef763 100644
--- a/document-crawler/Dockerfile
+++ b/document-crawler/Dockerfile
@@ -27,6 +27,9 @@ ENV CRAWL_BASE_PATH=/data/crawl
 ENV MAX_FILE_SIZE_MB=50
 
 # Expose port
+ARG BUILD_SHA="unknown"
+ENV BUILD_SHA=${BUILD_SHA}
+
 EXPOSE 8098
 
 # Health check
diff --git a/dsms-gateway/Dockerfile b/dsms-gateway/Dockerfile
index b04598dd..f0f656ce 100644
--- a/dsms-gateway/Dockerfile
+++ b/dsms-gateway/Dockerfile
@@ -22,6 +22,9 @@ ENV IPFS_GATEWAY_URL=http://dsms-node:8080
 ENV PORT=8082
 
 # Expose port
+ARG BUILD_SHA="unknown"
+ENV BUILD_SHA=${BUILD_SHA}
+
 EXPOSE 8082
 
 # Health check
diff --git a/dsms-node/Dockerfile b/dsms-node/Dockerfile
index 310076d8..ab946f00 100644
--- a/dsms-node/Dockerfile
+++ b/dsms-node/Dockerfile
@@ -14,6 +14,9 @@ ENV IPFS_PROFILE=server
 # 4001 - Swarm (P2P)
 # 5001 - API
 # 8080 - Gateway
+ARG BUILD_SHA="unknown"
+ENV BUILD_SHA=${BUILD_SHA}
+
 EXPOSE 4001
 EXPOSE 5001
 EXPOSE 8080