diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..795b99b
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,5 @@
+# Keep Linux shell scripts and container files on Unix line endings even when cloned on Windows.
+*.sh text eol=lf
+Dockerfile* text eol=lf
+*.yml text eol=lf
+*.yaml text eol=lf
diff --git a/.github/workflows/gpu-static-check.yml b/.github/workflows/gpu-static-check.yml
index 891d7ee..d27bd67 100644
--- a/.github/workflows/gpu-static-check.yml
+++ b/.github/workflows/gpu-static-check.yml
@@ -3,6 +3,7 @@ name: CPU/GPU direct-runner static check
 on:
   pull_request:
     paths:
+      - ".gitattributes"
       - "Dockerfile.cpu"
       - "Dockerfile.gpu"
       - "docker-compose.yml"
@@ -18,6 +19,7 @@ on:
   push:
     branches: [main]
     paths:
+      - ".gitattributes"
       - "Dockerfile.cpu"
       - "Dockerfile.gpu"
       - "docker-compose.yml"
@@ -77,25 +79,42 @@ jobs:
           cmp mock-release/lfm_aux.pt mock-downloaded/lfm_aux.pt
           cmp mock-release/lfm_dspark.pt mock-downloaded/lfm_dspark.pt
 
-      - name: Validate GPU shell entrypoint
-        run: bash -n scripts/test_gpu.sh
+      - name: Validate Linux shell entrypoint and line endings
+        run: |
+          bash -n scripts/test_gpu.sh
+          python - <<'PY'
+          from pathlib import Path
+          data = Path('scripts/test_gpu.sh').read_bytes()
+          assert b'\r\n' not in data, 'scripts/test_gpu.sh must be LF, not CRLF'
+          assert data.startswith(b'#!/usr/bin/env bash\n')
+          PY
+          grep -Fq '*.sh text eol=lf' .gitattributes
+          grep -Fq "sed -i 's/\\r$//' /app/scripts/test_gpu.sh" Dockerfile.gpu
 
       - name: Validate Docker Compose CPU and GPU services
         run: |
           docker compose --profile cpu --profile gpu config -q
           docker compose --profile cpu config --services | grep -qx test-cpu
           docker compose --profile gpu config --services | grep -qx test-gpu
+          docker compose --profile cpu config | grep -Fq 'image: dflash-mini-lab-test-cpu:latest'
+          docker compose --profile gpu config | grep -Fq 'image: dflash-mini-lab-test-gpu:latest'
 
       - name: Verify zero-install Docker paths
         run: |
-          grep -q 'torch torchvision' Dockerfile.cpu
-          grep -q 'download.pytorch.org/whl/cpu' Dockerfile.cpu
-          grep -q 'COPY run_gpu.py run_cpu.py' Dockerfile.cpu
+          # Keep the known-working Dockerfile installation style. Do not require
+          # version pins or a dedicated CPU wheel index for the CPU image.
+          grep -Fq 'python -m pip install torch torchvision' Dockerfile.cpu
+          grep -Fq 'python -m pip install numpy transformers' Dockerfile.cpu
+          grep -Fq 'COPY run_gpu.py run_cpu.py ./' Dockerfile.cpu
           ! grep -q 'pip install \.' Dockerfile.cpu
-          grep -q 'torch torchvision' Dockerfile.gpu
-          grep -q 'download.pytorch.org/whl/cu132' Dockerfile.gpu
-          grep -q 'COPY run_gpu.py' Dockerfile.gpu
+
+          # GPU keeps the same style but must use the CUDA 13.2 wheel index.
+          grep -Fq 'python -m pip install torch torchvision --index-url https://download.pytorch.org/whl/cu132' Dockerfile.gpu
+          grep -Fq 'python -m pip install numpy transformers' Dockerfile.gpu
+          grep -Fq 'COPY run_gpu.py ./run_gpu.py' Dockerfile.gpu
+          ! grep -Fq 'pip install install' Dockerfile.gpu
           ! grep -q 'pip install \.' Dockerfile.gpu
+
           grep -q 'gpus: all' docker-compose.yml
           grep -q 'test-cpu:' docker-compose.yml
           grep -q 'test-gpu:' docker-compose.yml
diff --git a/Dockerfile.gpu b/Dockerfile.gpu
index f4e7629..455e7ef 100644
--- a/Dockerfile.gpu
+++ b/Dockerfile.gpu
@@ -16,14 +16,18 @@ ENV PYTHONDONTWRITEBYTECODE=1 \
 WORKDIR /app
 
 RUN python -m pip install --upgrade pip \
- && python -m pip install install torch torchvision --index-url https://download.pytorch.org/whl/cu132 \
+ && python -m pip install torch torchvision --index-url https://download.pytorch.org/whl/cu132 \
  && python -m pip install numpy transformers
 
 COPY src ./src
 COPY real_benchmarks ./real_benchmarks
 COPY scripts ./scripts
 COPY run_gpu.py ./run_gpu.py
-RUN chmod +x /app/scripts/test_gpu.sh
+
+# Windows checkouts can provide CRLF shell scripts. Normalize inside the Linux image
+# as a second line of defense in addition to .gitattributes.
+RUN sed -i 's/\r$//' /app/scripts/test_gpu.sh \
+ && chmod +x /app/scripts/test_gpu.sh
 
 RUN mkdir -p /cache /app/lfm-artifacts /app/gpu-reports
 
diff --git a/docker-compose.yml b/docker-compose.yml
index b2ed04a..3b909c6 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -13,6 +13,7 @@ services:
 
   test-cpu:
     profiles: ["cpu"]
+    image: dflash-mini-lab-test-cpu:latest
     build:
       context: .
       dockerfile: Dockerfile.cpu
@@ -41,6 +42,7 @@ services:
 
   test-gpu:
     profiles: ["gpu"]
+    image: dflash-mini-lab-test-gpu:latest
     build:
       context: .
       dockerfile: Dockerfile.gpu