fix webui trainer callable globals

[bghira]

Summary

Ports the callable globals fix from whitejt2/SimpleTuner@2041c01 and adds a regression test.

The subprocess callable reconstruction path can rebuild a function with a globals dictionary that lacks sys. The generated runner script imports and uses sys, so providing it in the reconstructed callable globals prevents valid callables from failing when their serialized globals do not carry sys explicitly.

Validation

• .venv/bin/python -m unittest tests.test_process_keeper.TestProcessLifecycle.test_callable_payload_reconstruction_provides_sys_global -v
• .venv/bin/python -m unittest tests.test_process_keeper -v

[Copilot]

Pull request overview

This PR ports a fix to the subprocess “callable” payload reconstruction so reconstructed functions always have sys available in their globals, preventing failures when the serialized callable globals omit sys. It also adds a regression test to ensure the callable reconstruction path completes successfully in that scenario.

Changes:

• Ensure callable reconstruction initializes globals_dict with sys (in addition to __builtins__) before applying serialized globals metadata.
• Add a regression test that submits a reconstructed function lacking sys in its globals and asserts the job completes.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
simpletuner/simpletuner_sdk/process_keeper.py	Seeds reconstructed callable globals with sys to prevent NameError when executing serialized callables missing sys.
tests/test_process_keeper.py	Adds a regression test covering callable payload reconstruction when sys is absent from the callable’s serialized globals.

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