[justinchuby]

Summary

• add the reviewed Unique and NonMaxSuppression materialization syncs to the CUDA capture contract with their DeviceWorkspace/dynamic-output rationale
• bind each entry to its owning kernel, two-phase output policy, and explicit scalar-count D2H capture-refusal reason
• exercise real CUDA begin_graph_capture refusal and prove it occurs before either kernel phase executes

Reproduction

On origin/main, the exact contract command ran 2 tests: 1 passed and unconditional_syncs_are_limited_to_capture_unsupported_paths failed because unique.rs::materialize and non_max_suppression.rs::materialize were unreviewed.

Validation

• cargo test --locked -p onnx-runtime-ep-cuda --features cuda --test capture_sync_contract (3 passed)
• cargo test --locked -p onnx-runtime-ep-cuda --features cuda --lib capture::tests (3 passed)
• cargo test --locked -p onnx-runtime-ep-cuda --features cuda --lib kernels::unique::tests:: (2 passed, 2 CUDA tests ignored as expected)
• CUDA RTX 4060: Unique dynamic-output semantics/transfer/capture-refusal test (1 passed)
• CUDA RTX 4060: full nms_gpu target, including default DeviceWorkspace path and capture refusal (9 passed)
• cargo clippy -p onnx-runtime-ep-cuda --all-targets --features cuda,gpu-tests -- -D warnings
• cargo fmt -p onnx-runtime-ep-cuda --check

Mutation evidence

• changing Unique to CaptureSupport::Supported fails the new guard on the missing explicit refusal
• removing NMS's scalar D2H reason fails the new guard on the missing 8-byte count D2H synchronization contract

DFT and MultiHeadAttention entries are unchanged and remain covered by the existing allowlist equality check.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.03%. Comparing base (607dba7) to head (cc2ee00).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2180      +/-   ##
==========================================
+ Coverage   80.60%   81.03%   +0.43%     
==========================================
  Files         432      432              
  Lines      218383   218383              
  Branches   218383   218383              
==========================================
+ Hits       176027   176975     +948     
+ Misses      36511    35563     -948     
  Partials     5845     5845              

Flag	Coverage Δ
cli-ort-linux	72.51% <ø> (ø)
cli-ort-windows	72.01% <ø> (-0.10%)	⬇️
mlas	85.93% <ø> (+0.03%)	⬆️
offline	81.17% <ø> (+0.45%)	⬆️

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see 13 files with indirect coverage changes

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