Report engine-driven shared-memory transport identity

[voipmonitor]

Status

Implemented and qualified.

Resulting behavior

The engine-driven transfer module reports its shared-memory pool through the existing status endpoint:

{
  "engine_driven_shm_pool": {
    "shm_name": "lmcache_l1_pool_<instance>",
    "pool_size": 25769803776
  }
}

Operators can distinguish shared-memory transport from pickle fallback and verify the exact pool name and capacity without inspecting process memory maps.

Compatibility

The change is observability-only. It does not alter cache storage, transfer ordering, allocator ownership, fallback policy, or wire protocol.

Validation

• Focused status test: 1 passed.
• Ruff check and format: passed.
• A live 24 GiB engine-driven pool reported the expected POSIX shared-memory object and exact byte capacity through /status.
• The standalone cache process remained CPU-only while vLLM workers performed gather and scatter.

Development disclosure

The implementation and validation were completed with OpenAI Codex assistance under human direction.

[coderabbitai]

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Configuration used: Organization UI

Review profile: CHILL

Plan: Team

Run ID: 6b5ffd5b-7a9f-434b-82a8-0e7956f5a08d

📥 Commits

Reviewing files that changed from the base of the PR and between 7ed4675 and a726d46.

📒 Files selected for processing (2)

• lmcache/v1/multiprocess/modules/engine_driven_transfer.py
• tests/v1/multiprocess/test_engine_driven_transfer.py

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[voipmonitor]

Community integration receipt for #56: this exact PR head is already merged into integration/local-inference-lab through 0fae2935.

The original contributor commits are preserved. Exact head ancestry was verified, not inferred from equivalent file contents. Closing this dev-targeted review because its community integration is complete; this is not a claim that it merged into dev. Further community changes must target integration/local-inference-lab. GitHub cannot retarget an already-contained head because there are no new commits to merge.