more hardening

[ngc92]

make test seed invisible on the python stack

[Copilot]

Pull request overview

This PR hardens the isolated benchmark runner by moving benchmark configuration (signature/seed/repeats) out of Python function arguments and into a runner-controlled pipe read by the C++ layer before untrusted code is imported/executed.

Changes:

• Replace Python→C++ argument passing of seed/repeats with a pipe-fed config parsed in C++ (read_benchmark_parameters).
• Update the nanobind do_bench binding and Python subprocess target accordingly.
• Add BenchmarkResult.success and update the grayscale test script to use it.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
test/grayscale.py	Switches success indicator logic to use BenchmarkResult.success.
python/pygpubench/__init__.py	Moves config into a pipe, renames bench impl to private, and adds BenchmarkResult.success.
csrc/manager.h	Introduces BenchmarkParameters and updates BenchmarkManager constructor signature.
csrc/manager.cpp	Implements pipe config parsing and triggers gc.collect() before importing untrusted kernel code.
csrc/binding.cpp	Updates the nanobind binding signature to accept an input fd and read config in C++.

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[Copilot]

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated 4 comments.

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[Copilot]

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

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