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Silence CPython's constant-fold SyntaxWarning in cpython_batch_runner.py (#335)

list.test.ts's "[1, 2][0.0]" case (deliberately indexing a list literal
with a float to check ListIndexTypeError) makes CPython's compiler emit
"SyntaxWarning: list indices must be integers or slices, not float;
perhaps you missed a comma?" at compile() time -- a heads-up for a
common typo, irrelevant here since this harness only ever checks a
case's actual output/error/result, never compiler warnings. It's been
polluting CI output since CPYTHON_PATH was set in node.js.yml, letting
this parity harness actually run against real CPython.


Claude-Session: https://claude.ai/code/session_01KrwJGug3rCXijRseRjys9V

Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>

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