feat: add Jetson contributor validation path

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",

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",

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"
       ]
     },
     {