feat: add Jetson contributor validation path

.github/workflows/ci.yml

@@ -225,6 +225,45 @@ jobs:
           scripts/check_supply_chain_policy.py
           scripts/gemma4_12b_recursive_loop.py || true
 
+  arm64-preflight:
+    name: Linux ARM64 preflight
+    if: github.event_name == 'pull_request' || (github.event_name == 'push' && github.ref == 'refs/heads/main')
+    runs-on: ubuntu-24.04-arm
+    timeout-minutes: 10
+    env:
+      CUDA_VISIBLE_DEVICES: ""
+      HF_DATASETS_OFFLINE: "1"
+      HF_HUB_DISABLE_TELEMETRY: "1"
+      HF_HUB_OFFLINE: "1"
+      TRANSFORMERS_OFFLINE: "1"
+      TEST_ENV: /tmp/obliteratus-arm64-preflight
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - name: Set up Python
+        uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97 # v7.0.0
+        with:
+          python-version: "3.12"
+          cache: pip
+          cache-dependency-path: |
+            pyproject.toml
+            uv.lock
+      - name: Install locked CPU runtime
+        run: |
+          python -m pip install "uv==${UV_VERSION}"
+          UV_PROJECT_ENVIRONMENT="$TEST_ENV" \
+            uv sync --locked --no-default-groups --extra dev --no-editable
+      - name: Verify ARM64 package and core runtime
+        run: |
+          "$TEST_ENV/bin/python" -c \
+            'import platform; assert platform.machine().lower() in {"aarch64", "arm64"}'
+          "$TEST_ENV/bin/python" -m build --wheel
+          "$TEST_ENV/bin/python" -c 'import obliteratus; print(obliteratus.__version__)'
+          "$TEST_ENV/bin/python" -m obliteratus --help
+          "$TEST_ENV/bin/python" -m pytest \
+            tests/test_module_imports.py tests/test_device_boundaries.py \
+            tests/test_jetson_support_tooling.py -q --no-cov
+
   pr-core:
     name: Pull request core
     if: github.event_name == 'pull_request' || (github.event_name == 'push' && github.ref == 'refs/heads/main')