[yifjiang]

Summary

Typed IPC geometry, owned local access, one-time export consumption and cleanup; no host-payload staging.

Review slice D16 of #16748; part of #16747 and #16746. This draft targets codex/kv-reuse-d15-fabric-identities for a complete incremental review diff of 301 additions plus deletions, including tests, documentation and extraction glue.

Extraction details:

• Introduce the functional TP1 open_region path here; complete rank/FABRIC validation remains D22.

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 passed — run 41941663683 (attempt 2) on 9c2fd8a519

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

_{Posted automatically by Devin for run 41941663683. Updated on every full-CI run of this PR.}

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[yifjiang]

/ok to test 92047e4

[yifjiang]

/ok to test 9c2fd8a