[yifjiang]

Summary

Correct 64-bit FFI signatures, exact handle kind/size and native observation. This is not a fabric-allocation activation PR.

Review slice D18 of #16748; part of #16747 and #16746. This draft targets codex/kv-reuse-d17-rank-local-workers for a complete incremental review diff of 460 additions plus deletions, including tests, documentation and extraction glue.

Reuse remains experimental and default off. Retained inventory is advisory, complete compatible rank parts must precede readiness, and native operations retain ownership until quiescence. Supported GPU activation also requires the companion KVCR/native slices and the declared deployment profile.

Validation

All configured pre-commit hooks passed for this exact slice on allocated SLURM. Stack-level CPU regression coverage is summarized on D31; each draft still requires its own applicable CI in the Checks tab. Historical combined-head and hardware results retain their original source scope.

[devin-ai-integration]

⏹️ Dynamo PR CI cancelled — run 41941673575 (attempt 1) on ada5e7f003

Gate checks: ❌ backend-status-check · ❌ deploy-status-check · ✅ dynamo-status-check

Framework	Build	Deploy
vLLM	⏹️ 2 ✅ 4	⏹️ 1 ✅ 3

Failure details

The cancelled jobs exceeded their execution time limits, according to GitHub's job annotations; these were not reported as fail-fast or manual/concurrency cancellations.

⏹️ vllm-runtime-efa / Build multi-arch cuda13.0: cancelled during Build and Push Image; annotation: "The job has exceeded the maximum execution time of 1h0m0s".

⏹️ vllm-dev / Build multi-arch cuda13.0: cancelled during Build and Push Image; annotation: "The job has exceeded the maximum execution time of 1h0m0s".

⏹️ vllm Deploy Test / agg: cancelled during Run Dynamo Deploy Test; annotation: "The job has exceeded the maximum execution time of 25m0s".

For agents

{"pr": 18036, "run_id": 41941673575, "run_attempt": 1, "head_sha": "ada5e7f0034b5e4294bdf77c1c2da8e3091e6fc9", "failures": []}

_{Posted automatically by Devin for run 41941673575. Updated on every full-CI run of this PR.}

[copy-pr-bot]

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[yifjiang]

/ok to test 62c981a

[yifjiang]

/ok to test ada5e7f