diff --git a/.aiwg/architecture/adr/ADR-001-jetson-runtime-support.md b/.aiwg/architecture/adr/ADR-001-jetson-runtime-support.md
index 5060166..afa1cbc 100644
--- a/.aiwg/architecture/adr/ADR-001-jetson-runtime-support.md
+++ b/.aiwg/architecture/adr/ADR-001-jetson-runtime-support.md
@@ -5,6 +5,11 @@ Date: 2026-08-21
 Issue: https://github.com/elder-plinius/OBLITERATUS/issues/31
 Public plan: [docs/platforms/jetson.md](../../../docs/platforms/jetson.md)
 
+Implementation status: generic ARM64 preflight, vendor-PyTorch-preserving
+bootstrap, physical-device gate, sanitized evidence collector, manual runner
+workflow, and contributor issue form are implemented. The ADR remains Proposed
+until physical-device evidence fixes the initial supported matrix.
+
 ## Context
 
 OBLITERATUS currently resolves CPU-only PyTorch for Linux through its default
@@ -69,10 +74,12 @@ audited base-image and package provenance.
 1. Inventory the available Jetson and record its exact JetPack/L4T stack.
 2. Select and pin the initial Orin/JetPack 6.2.x matrix at an exact patch.
 3. Add generic ARM64 package/import preflight without changing default PR
-   dependencies.
-4. Add the Jetson constraints/profile and preferred container recipe.
+   dependencies. (Implemented.)
+4. Add the Jetson constraints/profile and preferred container recipe. (The
+   native/container bootstrap boundary is implemented; an exact image remains
+   dependent on the selected hardware matrix.)
 5. Add the `jetson-runtime` policy entry, test probe, trusted workflow job, and
-   retained evidence artifact.
+   retained evidence artifact. (Implemented.)
 6. Validate CUDA discovery, device selection, a tiny CUDA operation, and the
    offloaded-surgery probe. Validate source-built bitsandbytes separately.
 7. Claim support only for matrices with fresh green evidence on the exact
diff --git a/.aiwg/testing/jetson-support-assessment.md b/.aiwg/testing/jetson-support-assessment.md
index 71aef40..54233f4 100644
--- a/.aiwg/testing/jetson-support-assessment.md
+++ b/.aiwg/testing/jetson-support-assessment.md
@@ -260,6 +260,11 @@ the Jetson compatibility matrix must be version-pinned, not “latest by default
 
 ## Recommended implementation path
 
+Repository status as of 2026-08-21: steps 2 through 4 are implemented with a
+manual-only physical runner, a hosted ARM64 preflight, CPU-testable policy
+contracts, and a sanitized contributor evidence flow. Physical Jetson results
+are still required before completing steps 5 and 6 or publishing support.
+
 1. Keep issue #31 open as a feature/specification item until the acceptance
    matrix is merged.
 2. Add a Jetson conditional policy entry and workflow job with an explicit
diff --git a/.github/ISSUE_TEMPLATE/jetson-runtime.yml b/.github/ISSUE_TEMPLATE/jetson-runtime.yml
new file mode 100644
index 0000000..eb5ea7e
--- /dev/null
+++ b/.github/ISSUE_TEMPLATE/jetson-runtime.yml
@@ -0,0 +1,77 @@
+name: Jetson runtime report
+description: Report a physical Jetson bootstrap, build, or CUDA validation result
+title: "[Jetson] "
+labels:
+  - enhancement
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you for testing OBLITERATUS on physical Jetson hardware. Run the
+        documented `jetson-runtime` probe and attach its sanitized report. The
+        report intentionally omits host identity, network, serial, token, and
+        local-path data.
+  - type: dropdown
+    id: device
+    attributes:
+      label: Jetson device
+      options:
+        - Jetson AGX Orin
+        - Jetson Orin NX
+        - Jetson Orin Nano
+        - Jetson AGX Xavier
+        - Jetson AGX Thor
+    validations:
+      required: true
+  - type: input
+    id: jetpack
+    attributes:
+      label: Exact JetPack version
+      description: Include the patch version, for example 6.2.1.
+    validations:
+      required: true
+  - type: input
+    id: commit
+    attributes:
+      label: Exact OBLITERATUS commit
+      description: Paste the 40-character commit SHA that was tested.
+    validations:
+      required: true
+  - type: textarea
+    id: reproduction
+    attributes:
+      label: Reproduction commands
+      description: Provide the smallest command sequence that demonstrates the result.
+    validations:
+      required: true
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected result
+    validations:
+      required: true
+  - type: textarea
+    id: actual
+    attributes:
+      label: Actual result
+      description: Include the complete error text, but remove any secrets before submitting.
+    validations:
+      required: true
+  - type: textarea
+    id: evidence
+    attributes:
+      label: Sanitized Jetson evidence
+      description: Attach conditional-evidence/jetson-report.json or paste its JSON contents.
+    validations:
+      required: true
+  - type: checkboxes
+    id: confirmations
+    attributes:
+      label: Confirmations
+      options:
+        - label: I ran this validation on physical Jetson hardware.
+          required: true
+        - label: I reviewed the report and removed any secrets or personal identifiers.
+          required: true
+    validations:
+      required: true
diff --git a/.github/actionlint.yaml b/.github/actionlint.yaml
index a85f6a0..22ac661 100644
--- a/.github/actionlint.yaml
+++ b/.github/actionlint.yaml
@@ -1,6 +1,6 @@
 self-hosted-runner:
   # Project-owned capability labels used by conditional test runners.
-  labels: [cuda, mps, mlx]
+  labels: [cuda, jetson, mps, mlx]
 
 # Configuration variables in array of strings defined in your repository or
 # organization. `null` means disabling configuration variables check.
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e712d58..3354cbd 100644
--- a/.github/workflows/ci.yml
+++ b/.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
+          "$TEST_ENV/bin/python" -m pytest \
+            tests/test_module_imports.py tests/test_device_boundaries.py \
+            tests/test_jetson_support_tooling.py -q --no-cov
+
   pr-core:
     name: Pull request core
     if: github.event_name == 'pull_request' || (github.event_name == 'push' && github.ref == 'refs/heads/main')
diff --git a/.github/workflows/conditional-tests.yml b/.github/workflows/conditional-tests.yml
index 16442b8..c23f020 100644
--- a/.github/workflows/conditional-tests.yml
+++ b/.github/workflows/conditional-tests.yml
@@ -23,6 +23,10 @@ on:
         description: Run CUDA and bitsandbytes on the labeled self-hosted runner
         type: boolean
         default: false
+      run_jetson:
+        description: Run Jetson CUDA on the trusted labeled physical runner
+        type: boolean
+        default: false
       run_mps:
         description: Run MPS on the labeled Apple Silicon runner
         type: boolean
@@ -239,7 +243,7 @@ jobs:
         run: |
           python -m pip install "uv==${UV_VERSION}"
           UV_PROJECT_ENVIRONMENT="$CONDITIONAL_ENV" \
-            uv sync --locked --no-default-groups --extra dev --no-editable
+            uv sync --locked --no-default-groups --extra dev --extra quantization --no-editable
           CUDA_TORCH_VERSION="$("$CONDITIONAL_ENV/bin/python" -c \
             'import torch; print(torch.__version__.split("+", 1)[0])')"
           UV_TORCH_BACKEND=cu130 uv pip install \
@@ -264,6 +268,52 @@ jobs:
           if-no-files-found: error
           retention-days: 30
 
+  jetson:
+    name: NVIDIA Jetson runtime
+    needs: policy
+    if: github.event_name == 'workflow_dispatch' && inputs.run_jetson
+    runs-on: [self-hosted, linux, ARM64, jetson]
+    timeout-minutes: 45
+    env:
+      JETSON_ENV: /tmp/obliteratus-jetson-${{ github.run_id }}-${{ github.run_attempt }}
+      JETSON_TOOLS: /tmp/obliteratus-jetson-tools-${{ github.run_id }}-${{ github.run_attempt }}
+    steps:
+      - name: Check out trusted candidate
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - name: Install pinned bootstrap tooling outside the JetPack runtime
+        run: |
+          python3 -m venv "$JETSON_TOOLS"
+          "$JETSON_TOOLS/bin/python" -m pip install "uv==${UV_VERSION}"
+      - name: Preserve JetPack PyTorch and install OBLITERATUS
+        run: >-
+          python3 scripts/setup_jetson.py
+          --python python3
+          --uv-python "$JETSON_TOOLS/bin/python"
+          --venv "$JETSON_ENV"
+      - name: Run physical Jetson CUDA probe
+        run: >-
+          "$JETSON_ENV/bin/python" scripts/run_conditional_gate.py jetson-runtime
+      - name: Collect sanitized Jetson evidence
+        if: always()
+        run: |
+          JETSON_PYTHON=python3
+          if [ -x "$JETSON_ENV/bin/python" ]; then
+            JETSON_PYTHON="$JETSON_ENV/bin/python"
+          fi
+          "$JETSON_PYTHON" scripts/jetson_support.py \
+            --check \
+            --gate-evidence conditional-evidence/jetson-runtime.json \
+            --output conditional-evidence/jetson-report.json \
+            --issue-body conditional-evidence/jetson-issue.md
+      - name: Upload Jetson evidence
+        if: always()
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
+        with:
+          name: conditional-jetson-${{ github.run_attempt }}
+          path: conditional-evidence/
+          if-no-files-found: error
+          retention-days: 30
+
   mps:
     name: Apple MPS runtime
     needs: policy
@@ -393,20 +443,22 @@ jobs:
   summary:
     name: Conditional result and freshness summary
     if: always()
-    needs: [policy, model_runtime, network_services, operator_ui, cuda, mps, mlx, remote]
+    needs: [policy, model_runtime, network_services, operator_ui, cuda, jetson, mps, mlx, remote]
     runs-on: ubuntu-latest
     timeout-minutes: 5
     env:
       CONDITIONAL_RESULTS: >-
         {"policy":"${{ needs.policy.result }}","model_runtime":"${{ needs.model_runtime.result }}",
         "network_services":"${{ needs.network_services.result }}","operator_ui":"${{ needs.operator_ui.result }}",
-        "cuda":"${{ needs.cuda.result }}","mps":"${{ needs.mps.result }}","mlx":"${{ needs.mlx.result }}",
+        "cuda":"${{ needs.cuda.result }}","jetson":"${{ needs.jetson.result }}",
+        "mps":"${{ needs.mps.result }}","mlx":"${{ needs.mlx.result }}",
         "remote":"${{ needs.remote.result }}"}
       CONDITIONAL_SELECTED: >-
         {"model_runtime":${{ github.event_name != 'workflow_dispatch' || inputs.run_model }},
         "network_services":${{ github.event_name != 'workflow_dispatch' || inputs.run_network }},
         "operator_ui":${{ github.event_name != 'workflow_dispatch' || inputs.run_ui }},
         "cuda":${{ (github.event_name == 'workflow_dispatch' && inputs.run_cuda) || (github.event_name != 'workflow_dispatch' && vars.ENABLE_CUDA_GATE == 'true') }},
+        "jetson":${{ github.event_name == 'workflow_dispatch' && inputs.run_jetson }},
         "mps":${{ (github.event_name == 'workflow_dispatch' && inputs.run_mps) || (github.event_name != 'workflow_dispatch' && vars.ENABLE_MPS_GATE == 'true') }},
         "mlx":${{ (github.event_name == 'workflow_dispatch' && inputs.run_mlx) || (github.event_name != 'workflow_dispatch' && vars.ENABLE_MLX_GATE == 'true') }},
         "remote":${{ (github.event_name == 'workflow_dispatch' && inputs.run_remote) || (github.event_name != 'workflow_dispatch' && vars.ENABLE_REMOTE_GATE == 'true') }}}
diff --git a/.gitignore b/.gitignore
index dc750a1..db7a058 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,6 +8,7 @@ build/
 .eggs/
 *.egg
 .venv/
+.venv-jetson/
 venv/
 env/
 .env
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 03612c1..d1a1d2c 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -206,8 +206,8 @@ them in the managed environment.
 
 ## Conditional and hardware testing
 
-GPU, MPS, MLX, model-download, external-evaluation, network, operator-UI, and
-remote-execution checks are conditional release or risk-surface gates. A unit test
+GPU, Jetson, MPS, MLX, model-download, external-evaluation, network, operator-UI,
+and remote-execution checks are conditional release or risk-surface gates. A unit test
 with a mocked device is still required; hardware evidence complements deterministic
 contract coverage and never replaces it.
 
@@ -222,6 +222,13 @@ Current operator hardware includes Titan for CUDA/bitsandbytes probes and Mutsu,
 machines are attached to a public pull-request workflow; CI or a maintainer will
 record whether the mapped conditional gate ran.
 
+Jetson contributors do not need project-owned hardware access. Follow the
+[Jetson contributor bootstrap](docs/platforms/jetson.md#experimental-contributor-bootstrap)
+on a physical device, then submit the generated sanitized evidence through the
+[Jetson runtime report](https://github.com/elder-plinius/OBLITERATUS/issues/new?template=jetson-runtime.yml). Maintainers
+will reproduce, add missing test depth, and integrate compatible changes. Never
+attach a contributor-controlled runner to untrusted pull-request execution.
+
 ## Security and supply-chain expectations
 
 - Treat issue text, pull requests, patches, model repositories, checkpoints,
diff --git a/README.md b/README.md
index 9743dcd..84d20c5 100644
--- a/README.md
+++ b/README.md
@@ -162,6 +162,11 @@ obliteratus ui --auth user:pass     # add basic auth
 
 The `obliteratus ui` command adds a Rich terminal startup with GPU detection and hardware-appropriate model recommendations. You can also run `python app.py` directly (same thing the Space uses).
 
+Install `.[spaces,quantization]` instead when the UI must load supported
+bitsandbytes 8-bit or 4-bit models. Jetson users must follow the dedicated
+[Jetson bootstrap](docs/platforms/jetson.md); its bitsandbytes path is not yet
+supported.
+
 ### 3. Google Colab (free GPU)
 
 [![Open in Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/elder-plinius/OBLITERATUS/blob/main/notebooks/abliterate.ipynb)
@@ -457,6 +462,12 @@ This sets `CUDA_VISIBLE_DEVICES` before CUDA initializes. The model is then shar
 
 The `--dtype` flag controls the precision of model weights, which directly determines how much VRAM you need. Lower precision means smaller memory footprint at the cost of some numerical fidelity:
 
+Install the optional backend before selecting a bitsandbytes mode:
+
+```bash
+pip install -e ".[quantization]"
+```
+
 | Dtype | Bytes/param | 7B model | 70B model | 405B model |
 |-------|-----------|---------|----------|-----------|
 | `float32` | 4 | 28 GB | 280 GB | 1620 GB |
@@ -783,9 +794,10 @@ run the full Python matrix with 75% repository statement coverage, 60% repositor
 branch coverage, touched-module regression checks, mature-scope floors,
 deterministic property/order-repeat checks, selective mutation, package contracts,
 Windows portability, and supply-chain certification.
-Eight environment-bound test files run through the separately documented conditional
-workflow for model downloads, network services, operator UI, CUDA, bitsandbytes, MPS,
-MLX, and least-privileged remote execution.
+Nine environment-bound test files run through the separately documented conditional
+workflow for model downloads, network services, operator UI, CUDA, bitsandbytes,
+physical Jetson CUDA, MPS, MLX, and least-privileged remote execution. The Jetson
+lane is a trusted manual hardware probe; hosted ARM64 CI checks portability only.
 
 ## License
 
diff --git a/ci/conditional-test-policy.json b/ci/conditional-test-policy.json
index 0394c84..b1ab181 100644
--- a/ci/conditional-test-policy.json
+++ b/ci/conditional-test-policy.json
@@ -154,6 +154,19 @@
       "expected_cost": "included in cuda",
       "coverage_paths": ["obliteratus/models/loader.py"]
     },
+    {
+      "id": "jetson-runtime",
+      "job": "jetson",
+      "marker": "gpu",
+      "runner": "self-hosted, linux, ARM64, jetson",
+      "prerequisites": "trusted manual dispatch on physical Jetson hardware with a JetPack-aligned CUDA PyTorch runtime",
+      "expected_cost": "under 30 self-hosted runner-minutes",
+      "coverage_paths": [
+        "obliteratus/device.py",
+        "obliteratus/models/loader.py",
+        "obliteratus/models/offload_surgery.py"
+      ]
+    },
     {
       "id": "mps-runtime",
       "job": "mps",
diff --git a/ci/pr-test-policy.json b/ci/pr-test-policy.json
index 95cfeb9..7077141 100644
--- a/ci/pr-test-policy.json
+++ b/ci/pr-test-policy.json
@@ -13,13 +13,17 @@
     ".github/workflows/**",
     "ci/**",
     "scripts/check_*.py",
+    "scripts/jetson_*.py",
     "scripts/select_pr_tests.py",
+    "scripts/setup_jetson.py",
     "pyproject.toml",
     "uv.lock"
   ],
   "infrastructure_tests": [
     "tests/test_aiwg_workspace_contracts.py",
     "tests/test_ci_policy.py",
+    "tests/test_conditional_gate_scripts.py",
+    "tests/test_jetson_support_tooling.py",
     "tests/test_pr_test_selection.py",
     "tests/test_quality_policy.py",
     "tests/test_quality_gate_scripts.py",
diff --git a/ci/test-risk-map.json b/ci/test-risk-map.json
index 289ef64..de745b7 100644
--- a/ci/test-risk-map.json
+++ b/ci/test-risk-map.json
@@ -78,7 +78,8 @@
         "tests/test_offload_surgery.py",
         "tests/test_persistence_contracts.py",
         "tests/test_persistence_pipeline.py",
-        "tests/conditional/test_cuda_runtime.py"
+        "tests/conditional/test_cuda_runtime.py",
+        "tests/conditional/test_jetson_runtime.py"
       ]
     },
     {
@@ -134,7 +135,8 @@
         "tests/test_model_profile.py",
         "tests/test_model_profile_contracts.py",
         "tests/test_runtime_contracts.py",
-        "tests/test_study_presets.py"
+        "tests/test_study_presets.py",
+        "tests/conditional/test_jetson_runtime.py"
       ]
     },
     {
@@ -442,6 +444,7 @@
       ],
       "conditional_gates": [
         "cuda-runtime",
+        "jetson-runtime",
         "mps-runtime"
       ]
     },
@@ -466,6 +469,7 @@
       "conditional_gates": [
         "model-download-runtime",
         "cuda-runtime",
+        "jetson-runtime",
         "bitsandbytes-runtime"
       ]
     },
@@ -489,7 +493,8 @@
         "tests/conditional/test_cuda_runtime.py"
       ],
       "conditional_gates": [
-        "cuda-runtime"
+        "cuda-runtime",
+        "jetson-runtime"
       ]
     },
     {
diff --git a/docs/conditional-testing.md b/docs/conditional-testing.md
index 655e3da..07b4d61 100644
--- a/docs/conditional-testing.md
+++ b/docs/conditional-testing.md
@@ -70,21 +70,28 @@ probes.
 For an operator run on the labeled machine:
 
 ```bash
-uv sync --locked --extra dev
+uv sync --locked --extra dev --extra quantization
 CUDA_TORCH_VERSION="$(.venv/bin/python -c \
   'import torch; print(torch.__version__.split("+", 1)[0])')"
 UV_TORCH_BACKEND=cu130 uv pip install --python .venv/bin/python \
   --reinstall-package torch "torch==$CUDA_TORCH_VERSION"
 uv pip check --python .venv/bin/python
-uv run --extra dev python scripts/run_conditional_gate.py cuda-runtime
-uv run --extra dev python scripts/run_conditional_gate.py bitsandbytes-runtime
+uv run --extra dev --extra quantization python scripts/run_conditional_gate.py cuda-runtime
+uv run --extra dev --extra quantization python scripts/run_conditional_gate.py bitsandbytes-runtime
 ```
 
-Jetson CUDA support is tracked separately from this generic x64 CUDA lane. A
-generic Linux ARM build can prove package portability, but it does not prove
-Jetson GPU support because Jetson depends on a JetPack/L4T-matched CUDA, cuDNN,
-and PyTorch runtime. The support plan, recommended container path, and acceptance
-criteria are documented in [NVIDIA Jetson support plan](platforms/jetson.md).
+Jetson CUDA support is tracked separately from this generic x64 CUDA lane. The
+mandatory `Linux ARM64 preflight` uses GitHub's hosted `ubuntu-24.04-arm` runner
+to prove locked CPU packaging, imports, CLI startup, and Jetson tooling contracts.
+It is not GPU evidence. Jetson depends on a JetPack/L4T-matched CUDA, cuDNN, and
+PyTorch runtime.
+
+Physical testing uses only a trusted manual dispatch on the labels `self-hosted`,
+`linux`, `ARM64`, and `jetson`. The job preserves NVIDIA's vendor PyTorch, runs
+`jetson-runtime`, and uploads the sanitized `conditional-jetson-<run-attempt>`
+artifact for 30 days. It never runs for a pull request, schedule, or release.
+Contributor bootstrap, runner isolation, reporting commands, and acceptance
+criteria are documented in the [NVIDIA Jetson support plan](platforms/jetson.md).
 
 ## Apple MPS and MLX
 
diff --git a/docs/platforms/jetson.md b/docs/platforms/jetson.md
index 4be9af7..2120546 100644
--- a/docs/platforms/jetson.md
+++ b/docs/platforms/jetson.md
@@ -79,6 +79,41 @@ from being selected: upstream documents that wheel as SBSA/server ARM and says
 Jetson L4T/JetPack requires a source build. Until a pinned source build passes
 on the selected device, bitsandbytes is unsupported for that tier.
 
+### Experimental contributor bootstrap
+
+Start with NVIDIA's PyTorch wheel or PyTorch iGPU container for the exact
+JetPack patch installed on the device. Confirm that `python3 -c 'import torch;
+assert torch.cuda.is_available()'` succeeds before installing OBLITERATUS. Then,
+from a checkout of the exact commit under test, run:
+
+```bash
+python3 -m venv .venv-jetson-tools
+.venv-jetson-tools/bin/python -m pip install "uv==0.12.4"
+.venv-jetson-tools/bin/python scripts/setup_jetson.py \
+  --python python3 \
+  --uv-python .venv-jetson-tools/bin/python \
+  --venv .venv-jetson
+.venv-jetson/bin/python scripts/run_conditional_gate.py jetson-runtime
+.venv-jetson/bin/python scripts/jetson_support.py \
+  --check \
+  --gate-evidence conditional-evidence/jetson-runtime.json \
+  --output conditional-evidence/jetson-report.json \
+  --issue-body conditional-evidence/jetson-issue.md
+```
+
+The bootstrap validates ARM64, L4T, and CUDA before changing the environment.
+It creates a virtual environment with `--system-site-packages`, exports the
+committed lock, and installs locked OBLITERATUS dependencies without replacing
+the vendor `torch`. It also excludes bitsandbytes. The generic bitsandbytes
+package is now an explicit `quantization` extra for supported non-Jetson
+environments; Jetson quantization remains a separate source-build milestone.
+
+For JetPack 6.2, NVIDIA publishes the
+`nvcr.io/nvidia/pytorch:25.06-py3-igpu` container. Run it only on Jetson hardware
+with the NVIDIA runtime, mount a reviewed checkout, and use the same bootstrap
+inside the container. Match other JetPack releases through NVIDIA's
+compatibility table rather than substituting a `latest` tag.
+
 ## Conditional gate
 
 Add a new gate instead of modifying the x64 CUDA gate:
@@ -93,6 +128,35 @@ Add a new gate instead of modifying the x64 CUDA gate:
 The job must run only from a trusted ref or reviewed maintainer dispatch. A
 persistent self-hosted Jetson must never execute untrusted pull-request code.
 
+### Attaching a contributor-owned runner
+
+Register the runner using GitHub's self-hosted runner instructions, on the
+Jetson itself, and add the custom label `jetson`. GitHub supplies the
+`self-hosted`, `linux`, and `ARM64` default labels. Verify that the repository
+shows exactly these required labels before dispatching the job:
+
+```text
+self-hosted, linux, ARM64, jetson
+```
+
+Use a dedicated, non-personal runner account and a disposable or resettable
+workspace. Do not place Hugging Face, SSH, cloud, or signing credentials on the
+runner. Only a maintainer should manually dispatch `Conditional tests` against
+a reviewed commit; the Jetson job is deliberately unavailable to pull-request,
+scheduled, and release triggers. Remove the runner registration token after
+setup and keep the runner offline when it is not being used for reviewed work.
+
+### Reporting results without a project-owned Jetson
+
+Open the [Jetson runtime report](https://github.com/elder-plinius/OBLITERATUS/issues/new?template=jetson-runtime.yml)
+issue form and attach `conditional-evidence/jetson-report.json`, or paste the
+generated `conditional-evidence/jetson-issue.md`. The collector reports only an
+allow-listed architecture, OS/JetPack, PyTorch/CUDA, device-class, test-result,
+and commit profile. It excludes environment variables, hostnames, usernames,
+network addresses, device serials, tokens, and local filesystem paths. Review
+the file yourself before publishing it. A failed report is useful evidence and
+does not imply that the contributor must diagnose the compatibility problem.
+
 The gate should verify:
 
 - `platform.machine()` is `aarch64` or equivalent ARM64.
@@ -146,3 +210,6 @@ them.
 - [Astral: Using uv with PyTorch](https://docs.astral.sh/uv/guides/integration/pytorch/)
 - [Hugging Face: bitsandbytes installation guide](https://huggingface.co/docs/bitsandbytes/installation)
 - [GitHub: secure use of self-hosted runners](https://docs.github.com/en/actions/reference/security/secure-use#hardening-for-self-hosted-runners)
+- [GitHub: use self-hosted runner labels](https://docs.github.com/en/actions/how-tos/manage-runners/self-hosted-runners/use-in-a-workflow)
+- [GitHub: hosted ARM64 runners](https://docs.github.com/en/actions/reference/runners/github-hosted-runners)
+- [NVIDIA: PyTorch 25.06 for JetPack 6.2](https://docs.nvidia.com/deeplearning/frameworks/pytorch-release-notes/rel-25-06.html)
diff --git a/pyproject.toml b/pyproject.toml
index c044473..1bd7a82 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -34,7 +34,6 @@ dependencies = [
     "numpy>=1.24",
     "scikit-learn>=1.3",
     "tqdm>=4.64",
-    "bitsandbytes>=0.46.1",
 ]
 
 [project.urls]
@@ -51,6 +50,7 @@ dev = [
     "pytest-cov==7.1.0",
     "ruff==0.16.2",
 ]
+quantization = ["bitsandbytes>=0.46.1"]
 spaces = ["gradio>=6.7,<7.0"]
 
 [dependency-groups]
diff --git a/scripts/jetson_support.py b/scripts/jetson_support.py
new file mode 100644
index 0000000..6ce37a4
--- /dev/null
+++ b/scripts/jetson_support.py
@@ -0,0 +1,254 @@
+#!/usr/bin/env python3
+"""Collect privacy-safe Jetson runtime evidence for CI and issue reports."""
+
+from __future__ import annotations
+
+import argparse
+import importlib.metadata
+import json
+import os
+import platform
+import re
+import subprocess
+import sys
+from datetime import datetime, timezone
+from pathlib import Path
+from typing import Sequence
+
+
+ISSUE_URL = "https://github.com/elder-plinius/OBLITERATUS/issues/31"
+JETSON_RELEASE = Path("/etc/nv_tegra_release")
+OS_RELEASE = Path("/etc/os-release")
+SHA = re.compile(r"^[0-9a-f]{40}$")
+
+
+def _read_first_line(path: Path, *, limit: int = 500) -> str | None:
+    try:
+        return path.read_text(encoding="utf-8", errors="replace").splitlines()[0][:limit]
+    except (OSError, IndexError):
+        return None
+
+
+def _os_release(path: Path) -> dict[str, str]:
+    try:
+        lines = path.read_text(encoding="utf-8", errors="replace").splitlines()
+    except OSError:
+        return {}
+    values: dict[str, str] = {}
+    for line in lines:
+        key, separator, value = line.partition("=")
+        if separator and key in {"ID", "VERSION_ID", "PRETTY_NAME"}:
+            values[key.lower()] = value.strip().strip('"')[:200]
+    return values
+
+
+def _capture(command: Sequence[str], *, timeout: int = 10) -> str | None:
+    try:
+        result = subprocess.run(
+            command,
+            check=False,
+            capture_output=True,
+            text=True,
+            timeout=timeout,
+        )
+    except (OSError, subprocess.TimeoutExpired):
+        return None
+    if result.returncode != 0:
+        return None
+    value = result.stdout.strip()
+    return value[:500] or None
+
+
+def _candidate_sha() -> str:
+    candidate = os.environ.get("GITHUB_SHA", "")
+    if SHA.fullmatch(candidate):
+        return candidate
+    local = _capture(["git", "rev-parse", "HEAD"])
+    return local if local is not None and SHA.fullmatch(local) else "local"
+
+
+def collect_host_facts(
+    *,
+    tegra_release: Path = JETSON_RELEASE,
+    os_release: Path = OS_RELEASE,
+) -> dict[str, object]:
+    """Return an allow-listed host profile without identity or network data."""
+
+    return {
+        "architecture": platform.machine(),
+        "python_version": platform.python_version(),
+        "os": _os_release(os_release),
+        "l4t_release": _read_first_line(tegra_release),
+        "jetpack_package": _capture(
+            ["dpkg-query", "-W", "-f=${Version}", "nvidia-jetpack"],
+        ),
+    }
+
+
+def collect_runtime_facts() -> dict[str, object]:
+    """Return an allow-listed PyTorch/GPU profile without serials or file paths."""
+
+    facts: dict[str, object] = {
+        "torch_imported": False,
+        "torch_version": None,
+        "torch_cuda_version": None,
+        "cuda_available": False,
+        "cuda_device_count": 0,
+        "device_name": None,
+        "compute_capability": None,
+        "total_memory_gb": None,
+        "bitsandbytes_version": None,
+    }
+    try:
+        import torch
+    except Exception as exc:  # pragma: no cover - exact vendor loader failures vary
+        facts["torch_import_error"] = type(exc).__name__
+        return facts
+
+    facts.update({
+        "torch_imported": True,
+        "torch_version": str(torch.__version__),
+        "torch_cuda_version": torch.version.cuda,
+        "cuda_available": bool(torch.cuda.is_available()),
+        "cuda_device_count": int(torch.cuda.device_count()),
+    })
+    if facts["cuda_available"] and facts["cuda_device_count"]:
+        properties = torch.cuda.get_device_properties(0)
+        facts.update({
+            "device_name": str(properties.name)[:200],
+            "compute_capability": list(torch.cuda.get_device_capability(0)),
+            "total_memory_gb": round(properties.total_memory / 1024 ** 3, 2),
+        })
+    try:
+        facts["bitsandbytes_version"] = importlib.metadata.version("bitsandbytes")
+    except importlib.metadata.PackageNotFoundError:
+        pass
+    return facts
+
+
+def validate_report(report: dict[str, object]) -> tuple[list[str], list[str]]:
+    """Return blocking errors and non-blocking compatibility warnings."""
+
+    host = report["host"]
+    runtime = report["runtime"]
+    assert isinstance(host, dict)
+    assert isinstance(runtime, dict)
+    errors: list[str] = []
+    warnings: list[str] = []
+    if str(host.get("architecture", "")).lower() not in {"aarch64", "arm64"}:
+        errors.append("host architecture is not ARM64")
+    if not host.get("l4t_release"):
+        errors.append("/etc/nv_tegra_release is unavailable; this is not a Jetson L4T runtime")
+    if not runtime.get("torch_imported"):
+        errors.append("PyTorch could not be imported from the JetPack-aligned runtime")
+    elif not runtime.get("torch_cuda_version"):
+        errors.append("PyTorch is not a CUDA build")
+    elif not runtime.get("cuda_available"):
+        errors.append("PyTorch cannot access the Jetson CUDA device")
+    if runtime.get("bitsandbytes_version"):
+        warnings.append(
+            "bitsandbytes is installed but remains unsupported until its pinned Jetson "
+            "source build passes the separate quantization probe",
+        )
+    return errors, warnings
+
+
+def _gate_summary(path: Path | None) -> dict[str, object] | None:
+    if path is None:
+        return None
+    try:
+        value = json.loads(path.read_text(encoding="utf-8"))
+    except (OSError, json.JSONDecodeError):
+        return {"status": "unavailable"}
+    if not isinstance(value, dict):
+        return {"status": "invalid"}
+    summary: dict[str, object] = {}
+    for key in ("gate", "status"):
+        if isinstance(value.get(key), str):
+            summary[key] = value[key][:100]
+    git_sha = value.get("git_sha")
+    if isinstance(git_sha, str) and (SHA.fullmatch(git_sha) or git_sha == "local"):
+        summary["git_sha"] = git_sha
+    counts = value.get("counts")
+    if isinstance(counts, dict):
+        summary["counts"] = {
+            key: counts[key]
+            for key in ("tests", "failures", "errors", "skipped")
+            if isinstance(counts.get(key), int) and counts[key] >= 0
+        }
+    return summary
+
+
+def build_report(*, gate_evidence: Path | None = None) -> dict[str, object]:
+    report: dict[str, object] = {
+        "schema_version": 1,
+        "generated_at": datetime.now(timezone.utc).isoformat(),
+        "issue": ISSUE_URL,
+        "git_sha": _candidate_sha(),
+        "host": collect_host_facts(),
+        "runtime": collect_runtime_facts(),
+    }
+    errors, warnings = validate_report(report)
+    report["validation"] = {"errors": errors, "warnings": warnings}
+    gate = _gate_summary(gate_evidence)
+    if gate is not None:
+        report["gate_evidence"] = gate
+    return report
+
+
+def issue_body(report: dict[str, object]) -> str:
+    return "\n".join([
+        "## Jetson runtime report",
+        "",
+        "### What happened",
+        "<!-- Describe the command, expected result, and actual result. -->",
+        "",
+        "### Reproduction",
+        "<!-- Add the smallest command that reproduces the problem. -->",
+        "",
+        "### Sanitized environment evidence",
+        "",
+        "```json",
+        json.dumps(report, indent=2, sort_keys=True),
+        "```",
+        "",
+        "This report intentionally excludes environment variables, hostnames, usernames,",
+        "network addresses, GPU serials, tokens, and local filesystem paths.",
+        "",
+    ])
+
+
+def main() -> int:
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument(
+        "--output",
+        type=Path,
+        default=Path("conditional-evidence/jetson-report.json"),
+    )
+    parser.add_argument("--gate-evidence", type=Path)
+    parser.add_argument("--issue-body", type=Path)
+    parser.add_argument("--check", action="store_true")
+    args = parser.parse_args()
+
+    report = build_report(gate_evidence=args.gate_evidence)
+    args.output.parent.mkdir(parents=True, exist_ok=True)
+    args.output.write_text(json.dumps(report, indent=2, sort_keys=True) + "\n")
+    if args.issue_body is not None:
+        args.issue_body.parent.mkdir(parents=True, exist_ok=True)
+        args.issue_body.write_text(issue_body(report), encoding="utf-8")
+    validation = report["validation"]
+    assert isinstance(validation, dict)
+    errors = validation["errors"]
+    warnings = validation["warnings"]
+    assert isinstance(errors, list)
+    assert isinstance(warnings, list)
+    for warning in warnings:
+        print(f"WARNING: {warning}", file=sys.stderr)
+    for error in errors:
+        print(f"ERROR: {error}", file=sys.stderr)
+    print(args.output)
+    return 2 if args.check and errors else 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())
diff --git a/scripts/run_conditional_gate.py b/scripts/run_conditional_gate.py
index 1e78ac9..6a73e53 100644
--- a/scripts/run_conditional_gate.py
+++ b/scripts/run_conditional_gate.py
@@ -7,6 +7,7 @@ import argparse
 import importlib.util
 import json
 import os
+import platform
 import subprocess
 import sys
 from datetime import datetime, timezone
@@ -21,24 +22,31 @@ GATES = {
     "operator-ui": "tests/conditional/test_operator_ui.py",
     "cuda-runtime": "tests/conditional/test_cuda_runtime.py",
     "bitsandbytes-runtime": "tests/conditional/test_cuda_runtime.py",
+    "jetson-runtime": "tests/conditional/test_jetson_runtime.py",
     "mps-runtime": "tests/conditional/test_mps_runtime.py",
     "mlx-runtime": "tests/conditional/test_mlx_runtime.py",
     "remote-execution": "tests/conditional/test_remote_runtime.py",
 }
+JETSON_RELEASE = Path("/etc/nv_tegra_release")
 
 
 def missing_prerequisites(gate: str) -> list[str]:
     missing: list[str] = []
-    if gate in {"cuda-runtime", "bitsandbytes-runtime", "mps-runtime"}:
+    if gate in {"cuda-runtime", "bitsandbytes-runtime", "jetson-runtime", "mps-runtime"}:
         import torch
 
-        if gate.startswith("cuda") or gate.startswith("bitsandbytes"):
+        if gate.startswith(("cuda", "bitsandbytes", "jetson")):
             if not torch.cuda.is_available():
                 missing.append("a CUDA-capable PyTorch runtime")
         elif not (hasattr(torch.backends, "mps") and torch.backends.mps.is_available()):
             missing.append("an available Apple MPS backend")
     if gate == "bitsandbytes-runtime" and importlib.util.find_spec("bitsandbytes") is None:
         missing.append("bitsandbytes")
+    if gate == "jetson-runtime":
+        if platform.machine().lower() not in {"aarch64", "arm64"}:
+            missing.append("an ARM64 host")
+        if not JETSON_RELEASE.is_file():
+            missing.append("a Jetson L4T runtime")
     if gate == "mlx-runtime":
         for module in ("mlx", "mlx_lm"):
             if importlib.util.find_spec(module) is None:
diff --git a/scripts/setup_jetson.py b/scripts/setup_jetson.py
new file mode 100644
index 0000000..68ba6de
--- /dev/null
+++ b/scripts/setup_jetson.py
@@ -0,0 +1,190 @@
+#!/usr/bin/env python3
+"""Create an OBLITERATUS venv without replacing JetPack's PyTorch runtime."""
+
+from __future__ import annotations
+
+import argparse
+import re
+import subprocess
+import sys
+import tempfile
+from pathlib import Path
+from typing import Sequence
+
+
+EXCLUDED_PACKAGES = {"bitsandbytes", "torch"}
+NORMALIZE = re.compile(r"[-_.]+")
+
+
+def _run(command: Sequence[str], *, cwd: Path) -> None:
+    print("+ " + " ".join(command))
+    subprocess.run(command, cwd=cwd, check=True)
+
+
+def _require_new_or_reusable_venv(venv: Path, *, reuse: bool) -> None:
+    if not venv.exists():
+        return
+    if not reuse:
+        raise ValueError(f"virtual environment already exists: {venv}; pass --reuse to use it")
+    config = venv / "pyvenv.cfg"
+    try:
+        contents = config.read_text(encoding="utf-8").lower()
+    except OSError as exc:
+        raise ValueError(f"existing path is not a reusable virtual environment: {venv}") from exc
+    if "include-system-site-packages = true" not in contents:
+        raise ValueError(f"existing virtual environment does not expose JetPack packages: {venv}")
+
+
+def _require_safe_target(venv: Path, project: Path) -> None:
+    resolved = venv.resolve()
+    forbidden = {Path("/").resolve(), Path.home().resolve(), project.resolve()}
+    if resolved in forbidden:
+        raise ValueError(f"refusing unsafe virtual environment target: {resolved}")
+
+
+def _require_exclusions(requirements: Path) -> None:
+    emitted: set[str] = set()
+    for raw_line in requirements.read_text(encoding="utf-8").splitlines():
+        line = raw_line.strip()
+        if not line or line.startswith(("#", "--")):
+            continue
+        name = re.split(r"[<>=!~;@\[]", line, maxsplit=1)[0].strip()
+        emitted.add(NORMALIZE.sub("-", name).lower())
+    unexpected = sorted(EXCLUDED_PACKAGES & emitted)
+    if unexpected:
+        raise RuntimeError(f"Jetson export contains forbidden packages: {unexpected}")
+
+
+def prepare(
+    *,
+    project: Path,
+    venv: Path,
+    python: str,
+    uv_python: str,
+    reuse: bool,
+) -> None:
+    project = project.resolve()
+    support_script = project / "scripts" / "jetson_support.py"
+    if not support_script.is_file() or not (project / "uv.lock").is_file():
+        raise ValueError(f"not an OBLITERATUS checkout: {project}")
+    _require_safe_target(venv, project)
+    _require_new_or_reusable_venv(venv, reuse=reuse)
+
+    with tempfile.TemporaryDirectory(prefix="obliteratus-jetson-") as temp_value:
+        temp = Path(temp_value)
+        _run(
+            [python, str(support_script), "--check", "--output", str(temp / "host.json")],
+            cwd=project,
+        )
+        _run([uv_python, "-m", "uv", "--version"], cwd=project)
+        if not venv.exists():
+            _run([python, "-m", "venv", "--system-site-packages", str(venv)], cwd=project)
+
+        target_python = venv / "bin" / "python"
+        _run(
+            [
+                str(target_python),
+                str(support_script),
+                "--check",
+                "--output",
+                str(temp / "venv.json"),
+            ],
+            cwd=project,
+        )
+        requirements = temp / "requirements-jetson.txt"
+        _run(
+            [
+                uv_python,
+                "-m",
+                "uv",
+                "export",
+                "--locked",
+                "--no-default-groups",
+                "--extra",
+                "dev",
+                "--no-emit-project",
+                "--no-emit-package",
+                "torch",
+                "--no-emit-package",
+                "bitsandbytes",
+                "--no-annotate",
+                "--no-header",
+                "--no-hashes",
+                "--output-file",
+                str(requirements),
+            ],
+            cwd=project,
+        )
+        _require_exclusions(requirements)
+        _run(
+            [
+                uv_python,
+                "-m",
+                "uv",
+                "pip",
+                "install",
+                "--python",
+                str(target_python),
+                "--no-deps",
+                "--requirements",
+                str(requirements),
+            ],
+            cwd=project,
+        )
+        _run(
+            [
+                uv_python,
+                "-m",
+                "uv",
+                "pip",
+                "install",
+                "--python",
+                str(target_python),
+                "--no-deps",
+                "--editable",
+                str(project),
+            ],
+            cwd=project,
+        )
+        _run(
+            [uv_python, "-m", "uv", "pip", "check", "--python", str(target_python)],
+            cwd=project,
+        )
+
+    print("Jetson environment prepared without replacing vendor PyTorch.")
+    print(f"Run: {target_python} scripts/run_conditional_gate.py jetson-runtime")
+    print(
+        f"Then: {target_python} scripts/jetson_support.py --check "
+        "--gate-evidence conditional-evidence/jetson-runtime.json "
+        "--issue-body conditional-evidence/jetson-issue.md",
+    )
+
+
+def main() -> int:
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument("--project", type=Path, default=Path(__file__).parents[1])
+    parser.add_argument("--venv", type=Path, default=Path(".venv-jetson"))
+    parser.add_argument("--python", default=sys.executable)
+    parser.add_argument(
+        "--uv-python",
+        default=sys.executable,
+        help="interpreter containing the pinned uv module (defaults to this interpreter)",
+    )
+    parser.add_argument("--reuse", action="store_true")
+    args = parser.parse_args()
+    try:
+        prepare(
+            project=args.project,
+            venv=args.venv,
+            python=args.python,
+            uv_python=args.uv_python,
+            reuse=args.reuse,
+        )
+    except (OSError, RuntimeError, subprocess.CalledProcessError, ValueError) as exc:
+        print(f"ERROR: {exc}", file=sys.stderr)
+        return 2
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())
diff --git a/tests/conditional/test_jetson_runtime.py b/tests/conditional/test_jetson_runtime.py
new file mode 100644
index 0000000..22d3d34
--- /dev/null
+++ b/tests/conditional/test_jetson_runtime.py
@@ -0,0 +1,53 @@
+"""Physical NVIDIA Jetson CUDA placement and operation probe."""
+
+from __future__ import annotations
+
+import platform
+from pathlib import Path
+
+import pytest
+import torch
+import torch.nn as nn
+from accelerate.hooks import AlignDevicesHook, add_hook_to_module
+
+from obliteratus import device
+from obliteratus.abliterate import AbliterationPipeline
+
+
+pytestmark = pytest.mark.gpu
+
+
+def test_jetson_cuda_runtime_contract():
+    assert platform.machine().lower() in {"aarch64", "arm64"}
+    assert Path("/etc/nv_tegra_release").is_file()
+    assert torch.version.cuda is not None
+    assert torch.cuda.is_available()
+    assert torch.cuda.device_count() > 0
+    assert device.is_cuda()
+    assert device.get_device("auto") == "cuda"
+    tensor = torch.arange(16, device="cuda", dtype=torch.float32).reshape(4, 4)
+    result = tensor @ tensor.T
+    assert result.device.type == "cuda"
+    assert torch.isfinite(result).all()
+
+
+def test_jetson_cuda_offloaded_surgery_contract():
+    module = nn.Module()
+    module.proj = nn.Linear(4, 4, bias=False)
+    original = module.proj.weight.detach().clone()
+    hook = AlignDevicesHook(execution_device="cuda", offload=True)
+    add_hook_to_module(module.proj, hook)
+
+    count = AbliterationPipeline._project_out_advanced(
+        module,
+        torch.tensor([[1.0], [0.0], [0.0], [0.0]], device="cuda"),
+        ["proj"],
+    )
+    output = module.proj(torch.ones(1, 4, device="cuda"))
+
+    expected = original.clone()
+    expected[:, 0] = 0
+    assert count == 1
+    assert output.device.type == "cuda"
+    assert module.proj.weight.device.type == "meta"
+    torch.testing.assert_close(hook.weights_map["weight"], expected)
diff --git a/tests/test_ci_policy.py b/tests/test_ci_policy.py
index 576b005..aa3adfc 100644
--- a/tests/test_ci_policy.py
+++ b/tests/test_ci_policy.py
@@ -129,6 +129,24 @@ def test_pull_request_gate_is_fast_risk_mapped_and_uses_shared_floor():
     assert "tests/conditional/" in policy["excluded_test_prefixes"]
 
 
+def test_arm64_preflight_proves_portability_without_claiming_jetson_cuda():
+    workflow = WORKFLOW.read_text(encoding="utf-8")
+    arm = workflow.split("  arm64-preflight:\n", maxsplit=1)[1].split(
+        "  pr-core:\n",
+        maxsplit=1,
+    )[0]
+
+    assert "runs-on: ubuntu-24.04-arm" in arm
+    assert "github.event_name == 'pull_request'" in arm
+    assert "github.event_name == 'push' && github.ref == 'refs/heads/main'" in arm
+    assert "-m build --wheel" in arm
+    assert "import obliteratus" in arm
+    assert "-m obliteratus --help" in arm
+    assert "tests/test_device_boundaries.py" in arm
+    assert "tests/test_jetson_support_tooling.py" in arm
+    assert "jetson-runtime" not in arm
+
+
 def test_release_depth_jobs_only_run_for_tags_or_manual_validation():
     workflow = WORKFLOW.read_text(encoding="utf-8")
     release_condition = (
diff --git a/tests/test_conditional_gate_scripts.py b/tests/test_conditional_gate_scripts.py
index 0dc1f34..80d4822 100644
--- a/tests/test_conditional_gate_scripts.py
+++ b/tests/test_conditional_gate_scripts.py
@@ -42,6 +42,7 @@ def test_cuda_job_replaces_locked_cpu_torch_with_same_version_cuda_build():
     cuda_job = workflow.split("  cuda:\n", maxsplit=1)[1].split("  mps:\n", maxsplit=1)[0]
 
     assert "torch.__version__.split" in cuda_job
+    assert "--extra quantization" in cuda_job
     assert "UV_TORCH_BACKEND=cu130 uv pip install" in cuda_job
     assert "--reinstall-package torch" in cuda_job
     assert '"torch==$CUDA_TORCH_VERSION"' in cuda_job
@@ -49,6 +50,28 @@ def test_cuda_job_replaces_locked_cpu_torch_with_same_version_cuda_build():
     assert 'uv pip check --python "$CONDITIONAL_ENV/bin/python"' in cuda_job
 
 
+def test_jetson_job_is_manual_physical_trusted_and_retains_sanitized_evidence():
+    workflow = (ROOT / ".github" / "workflows" / "conditional-tests.yml").read_text()
+    jetson_job = workflow.split("  jetson:\n", maxsplit=1)[1].split(
+        "  mps:\n",
+        maxsplit=1,
+    )[0]
+
+    assert "github.event_name == 'workflow_dispatch' && inputs.run_jetson" in jetson_job
+    assert "runs-on: [self-hosted, linux, ARM64, jetson]" in jetson_job
+    assert "scripts/setup_jetson.py" in jetson_job
+    assert "scripts/run_conditional_gate.py jetson-runtime" in jetson_job
+    assert "scripts/jetson_support.py" in jetson_job
+    assert "conditional-jetson-${{ github.run_attempt }}" in jetson_job
+    assert "retention-days: 30" in jetson_job
+    assert "actions/setup-python" not in jetson_job
+
+    policy = json.loads((ROOT / "ci" / "conditional-test-policy.json").read_text())
+    gate = next(value for value in policy["gates"] if value["id"] == "jetson-runtime")
+    assert gate["job"] == "jetson"
+    assert gate["runner"] == "self-hosted, linux, ARM64, jetson"
+
+
 def test_policy_rejects_unknown_cpu_exclusion_gate(tmp_path):
     policy = json.loads((ROOT / "ci" / "conditional-test-policy.json").read_text())
     quality = {
diff --git a/tests/test_jetson_support_tooling.py b/tests/test_jetson_support_tooling.py
new file mode 100644
index 0000000..2a0ddb8
--- /dev/null
+++ b/tests/test_jetson_support_tooling.py
@@ -0,0 +1,254 @@
+"""CPU-testable contracts for the experimental Jetson support path."""
+
+from __future__ import annotations
+
+import importlib.metadata
+import json
+import sys
+import tomllib
+from pathlib import Path
+from types import SimpleNamespace
+
+import pytest
+import yaml
+
+from scripts import jetson_support
+from scripts import run_conditional_gate
+from scripts import setup_jetson
+
+
+ROOT = Path(__file__).parents[1]
+
+
+def test_host_evidence_is_allow_listed(monkeypatch, tmp_path):
+    tegra = tmp_path / "nv_tegra_release"
+    tegra.write_text("# R36 (release), REVISION: 4.3\nserial=secret\n")
+    os_release = tmp_path / "os-release"
+    os_release.write_text(
+        'ID=ubuntu\nVERSION_ID="22.04"\nPRETTY_NAME="Ubuntu 22.04"\nSECRET=value\n'
+    )
+    monkeypatch.setattr(jetson_support.platform, "machine", lambda: "aarch64")
+    monkeypatch.setattr(jetson_support.platform, "python_version", lambda: "3.10.12")
+    monkeypatch.setattr(jetson_support, "_capture", lambda command, **kwargs: "6.2+b17")
+
+    facts = jetson_support.collect_host_facts(
+        tegra_release=tegra,
+        os_release=os_release,
+    )
+
+    assert facts == {
+        "architecture": "aarch64",
+        "python_version": "3.10.12",
+        "os": {
+            "id": "ubuntu",
+            "version_id": "22.04",
+            "pretty_name": "Ubuntu 22.04",
+        },
+        "l4t_release": "# R36 (release), REVISION: 4.3",
+        "jetpack_package": "6.2+b17",
+    }
+    assert "secret" not in json.dumps(facts).lower()
+
+
+def test_runtime_evidence_reports_cuda_without_device_identity(monkeypatch):
+    properties = SimpleNamespace(name="Orin", total_memory=64 * 1024**3)
+    fake_cuda = SimpleNamespace(
+        is_available=lambda: True,
+        device_count=lambda: 1,
+        get_device_properties=lambda _index: properties,
+        get_device_capability=lambda _index: (8, 7),
+    )
+    fake_torch = SimpleNamespace(
+        __version__="2.8.0a0+nv25.06",
+        version=SimpleNamespace(cuda="12.6"),
+        cuda=fake_cuda,
+    )
+    monkeypatch.setitem(sys.modules, "torch", fake_torch)
+
+    def missing_package(_name):
+        raise importlib.metadata.PackageNotFoundError
+
+    monkeypatch.setattr(jetson_support.importlib.metadata, "version", missing_package)
+
+    facts = jetson_support.collect_runtime_facts()
+
+    assert facts["cuda_available"] is True
+    assert facts["device_name"] == "Orin"
+    assert facts["compute_capability"] == [8, 7]
+    assert facts["total_memory_gb"] == 64.0
+    assert set(facts) == {
+        "torch_imported",
+        "torch_version",
+        "torch_cuda_version",
+        "cuda_available",
+        "cuda_device_count",
+        "device_name",
+        "compute_capability",
+        "total_memory_gb",
+        "bitsandbytes_version",
+    }
+
+
+def test_report_validation_blocks_non_jetson_or_non_cuda_and_warns_on_bnb():
+    report = {
+        "host": {"architecture": "x86_64", "l4t_release": None},
+        "runtime": {
+            "torch_imported": True,
+            "torch_cuda_version": None,
+            "cuda_available": False,
+            "bitsandbytes_version": "0.47.0",
+        },
+    }
+
+    errors, warnings = jetson_support.validate_report(report)
+
+    assert len(errors) == 3
+    assert any("ARM64" in error for error in errors)
+    assert any("Jetson L4T" in error for error in errors)
+    assert any("not a CUDA build" in error for error in errors)
+    assert warnings and "unsupported" in warnings[0]
+
+
+def test_gate_evidence_and_issue_body_cannot_copy_arbitrary_fields(tmp_path):
+    evidence = tmp_path / "gate.json"
+    evidence.write_text(json.dumps({
+        "gate": "jetson-runtime",
+        "status": "passed",
+        "git_sha": "a" * 40,
+        "counts": {"tests": 1, "token": "nested-secret"},
+        "token": "must-not-escape",
+        "hostname": "must-not-escape",
+    }))
+
+    summary = jetson_support._gate_summary(evidence)
+    body = jetson_support.issue_body({"gate_evidence": summary})
+
+    assert summary == {
+        "gate": "jetson-runtime",
+        "status": "passed",
+        "git_sha": "a" * 40,
+        "counts": {"tests": 1},
+    }
+    assert "must-not-escape" not in body
+    assert "nested-secret" not in body
+    assert "excludes environment variables" in body
+
+
+def test_dependency_export_rejects_torch_and_bitsandbytes(tmp_path):
+    requirements = tmp_path / "requirements.txt"
+    requirements.write_text("transformers==4.56.0\npytest==8.4.1\n")
+    setup_jetson._require_exclusions(requirements)
+
+    for forbidden in (
+        "torch==2.8.0",
+        "torch @ https://example.invalid/torch.whl",
+        "bitsandbytes[diagnostics]==0.47.0",
+    ):
+        requirements.write_text(forbidden + "\n")
+        with pytest.raises(RuntimeError, match="forbidden packages"):
+            setup_jetson._require_exclusions(requirements)
+
+
+def test_jetson_bootstrap_preserves_vendor_runtime_and_uses_locked_no_deps(
+    monkeypatch,
+    tmp_path,
+):
+    project = tmp_path / "project"
+    (project / "scripts").mkdir(parents=True)
+    (project / "scripts" / "jetson_support.py").write_text("# fixture\n")
+    (project / "uv.lock").write_text("# fixture\n")
+    venv = tmp_path / "jetson-venv"
+    commands: list[list[str]] = []
+
+    def fake_run(command, *, cwd):
+        command = list(command)
+        commands.append(command)
+        if command[1:4] == ["-m", "venv", "--system-site-packages"]:
+            (venv / "bin").mkdir(parents=True)
+            (venv / "pyvenv.cfg").write_text("include-system-site-packages = true\n")
+        if "--output-file" in command:
+            output = Path(command[command.index("--output-file") + 1])
+            output.write_text("transformers==4.56.0\n")
+
+    monkeypatch.setattr(setup_jetson, "_run", fake_run)
+
+    setup_jetson.prepare(
+        project=project,
+        venv=venv,
+        python="vendor-python",
+        uv_python="tool-python",
+        reuse=False,
+    )
+
+    assert commands[0][0] == "vendor-python"
+    assert "--check" in commands[0]
+    export = next(command for command in commands if "export" in command)
+    assert export.count("--no-emit-package") == 2
+    assert "torch" in export and "bitsandbytes" in export
+    installs = [command for command in commands if "install" in command]
+    assert len(installs) == 2
+    assert all("--no-deps" in command for command in installs)
+    assert any("check" in command for command in commands)
+
+
+def test_bootstrap_rejects_unsafe_or_non_vendor_reusable_targets(tmp_path):
+    project = tmp_path / "project"
+    project.mkdir()
+    with pytest.raises(ValueError, match="unsafe"):
+        setup_jetson._require_safe_target(project, project)
+
+    existing = tmp_path / "existing"
+    existing.mkdir()
+    (existing / "pyvenv.cfg").write_text("include-system-site-packages = false\n")
+    with pytest.raises(ValueError, match="does not expose JetPack"):
+        setup_jetson._require_new_or_reusable_venv(existing, reuse=True)
+
+
+def test_bitsandbytes_is_opt_in_for_quantization_only():
+    metadata = tomllib.loads((ROOT / "pyproject.toml").read_text())
+    base = metadata["project"]["dependencies"]
+    extras = metadata["project"]["optional-dependencies"]
+
+    assert not any(value.startswith("bitsandbytes") for value in base)
+    assert extras["quantization"] == ["bitsandbytes>=0.46.1"]
+
+
+def test_jetson_issue_form_requires_reproducible_sanitized_hardware_evidence():
+    form = yaml.safe_load(
+        (ROOT / ".github" / "ISSUE_TEMPLATE" / "jetson-runtime.yml").read_text(),
+    )
+    fields = {value.get("id"): value for value in form["body"] if value.get("id")}
+
+    assert set(fields) == {
+        "device",
+        "jetpack",
+        "commit",
+        "reproduction",
+        "expected",
+        "actual",
+        "evidence",
+        "confirmations",
+    }
+    assert all(value.get("validations", {}).get("required") for value in fields.values())
+    confirmations = fields["confirmations"]["attributes"]["options"]
+    assert all(option["required"] for option in confirmations)
+    assert any("secrets" in option["label"] for option in confirmations)
+
+
+def test_jetson_conditional_prerequisites_are_physical_and_cuda(monkeypatch, tmp_path):
+    fake_torch = SimpleNamespace(cuda=SimpleNamespace(is_available=lambda: True))
+    monkeypatch.setitem(sys.modules, "torch", fake_torch)
+    monkeypatch.setattr(run_conditional_gate.platform, "machine", lambda: "aarch64")
+    tegra = tmp_path / "nv_tegra_release"
+    tegra.write_text("# R36\n")
+    monkeypatch.setattr(run_conditional_gate, "JETSON_RELEASE", tegra)
+    assert run_conditional_gate.missing_prerequisites("jetson-runtime") == []
+
+    monkeypatch.setattr(run_conditional_gate.platform, "machine", lambda: "x86_64")
+    fake_torch.cuda.is_available = lambda: False
+    tegra.unlink()
+    assert run_conditional_gate.missing_prerequisites("jetson-runtime") == [
+        "a CUDA-capable PyTorch runtime",
+        "an ARM64 host",
+        "a Jetson L4T runtime",
+    ]
diff --git a/uv.lock b/uv.lock
index 53f8a6d..bb2c903 100644
--- a/uv.lock
+++ b/uv.lock
@@ -15,7 +15,7 @@ resolution-markers = [
 ]
 
 [options]
-exclude-newer = "2026-08-11T18:17:23.461940614Z"
+exclude-newer = "2026-08-19T00:05:48.361273363Z"
 exclude-newer-span = "P3D"
 
 [manifest]
@@ -2602,7 +2602,6 @@ version = "0.1.2"
 source = { editable = "." }
 dependencies = [
     { name = "accelerate" },
-    { name = "bitsandbytes" },
     { name = "datasets" },
     { name = "matplotlib", version = "3.10.9", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.11'" },
     { name = "matplotlib", version = "3.11.1", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.11'" },
@@ -2631,6 +2630,9 @@ dev = [
     { name = "pytest-cov" },
     { name = "ruff" },
 ]
+quantization = [
+    { name = "bitsandbytes" },
+]
 spaces = [
     { name = "gradio" },
 ]
@@ -2652,7 +2654,7 @@ quality = [
 [package.metadata]
 requires-dist = [
     { name = "accelerate", specifier = ">=0.24" },
-    { name = "bitsandbytes", specifier = ">=0.46.1" },
+    { name = "bitsandbytes", marker = "extra == 'quantization'", specifier = ">=0.46.1" },
     { name = "build", marker = "extra == 'dev'", specifier = "==1.2.2.post1" },
     { name = "datasets", specifier = ">=2.14" },
     { name = "gradio", marker = "extra == 'spaces'", specifier = ">=6.7,<7.0" },
@@ -2674,7 +2676,7 @@ requires-dist = [
     { name = "tqdm", specifier = ">=4.64" },
     { name = "transformers", specifier = ">=4.40" },
 ]
-provides-extras = ["dev", "spaces"]
+provides-extras = ["dev", "quantization", "spaces"]
 
 [package.metadata.requires-dev]
 ci = [