[xingguo01]

Expose mutable buffer aliasing through the LLM export configuration and forward it to the VGF partitioner for static quantized KV caches.

Update the SmolLM2 VGF example with the supported export command, persistent runner handling, timestamp reporting, and parallel WikiText perplexity scoring. Wait for runner completion before reading logits, kill hung runners during cleanup, and let evaluation select the KV input dtype. Support tokenizers without a BOS token.

AI-assisted-by: Codex

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218 @mansnils @Sebastian-Larsson @robell @rascani

[pytorch-bot]

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❌ 1 New Failure, 2 Pending, 1 Unclassified Failure

As of commit f7481c6 with merge base 3d5172b ():

NEW FAILURE - The following job has failed:

• Lint / lintrunner-mypy (gh)
  >>> Lint for backends/arm/test/modules/test_moe.py:

UNCLASSIFIED FAILURE - DrCI could not classify the following job because the workflow did not run on the merge base. The failure may be pre-existing on trunk or introduced by this PR:

• Test Vulkan Backend (specialized runners) / test-model-vulkan-e2e / linux-job (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  RuntimeError: Command bash /__w/_temp/exec_script failed with exit code 1

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