Test clone requests on the early-enqueue path

[Crane-Liu]

Summary

Add the Step 3 clone-request contract checks to the public Worker.submit early-enqueue path.

Part of #2429

Scope

• Verify two independent submissions with the same request structure and request-private buffers.
• Keep distinct output sentinels so result attribution and cross-run overwrite remain observable.
• Assert distinct buffer identities, mapped addresses, run/task identities, and pipeline leases.
• Exercise the staged submission through acceptance, completion, and release.
• Preserve parent FIFO, serial operator execution, late-read, and refill behavior.

This PR contains test-contract coverage only. It does not add adapter code, DEVICE feedback, HBG distinct support, A5/TMR support, or runtime admission changes.

Validation

• Rebased onto main at 833327f60ea8f4772bf1673ea8edb349314a350d.
• Python compile and changed-file path scan passed.
• Targeted C++ tests, Ruff, Ruff format, clang-format, and A3 host_build_graph validation passed before the rebase.
• GitHub CI is running on the rebased head.

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📥 Commits

Reviewing files that changed from the base of the PR and between 818ee04 and e44ae36.

📒 Files selected for processing (2)

• tests/st/a2a3/host_build_graph/early_enqueue/test_early_enqueue.py
• tests/ut/cpp/common/hierarchical/test_early_launch_admission.cpp

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📝 Walkthrough

Walkthrough

The tests now use matching tensor inputs to check that separate runs retain distinct buffers and run identities. Unit tests also check task slots, pipeline leases, admission, completion, and release.

Changes

Clone run isolation and admission

Layer / File(s)	Summary
Clone identity and admission validation tests/ut/cpp/common/hierarchical/test_early_launch_admission.cpp, tests/st/a2a3/host_build_graph/early_enqueue/test_early_enqueue.py	Unit tests check matching tensor metadata, distinct run and buffer identities, task slots, pipeline leases, admission, completion, and release. The two-run test checks that matching input values use distinct buffers and base addresses.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Other

Merge Risk: ⚪ Minimal · up to e44ae

This change adds coverage for clone-request isolation and admission without changing runtime behavior. No actionable issue warrants blocking the merge.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly summarizes the main change: adding tests for clone requests on the early-enqueue path.
Description check	✅ Passed	The description directly explains the test coverage, scope, preserved behaviors, and validation for the early-enqueue clone-request changes.

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_{A rabbit checks two runs in flight,
Their matching shapes, their buffers bright.
Distinct slots hold each run apart,
One grants the next its launch-start.
Then both complete, and leases depart.}

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