fix(parser): harden Python and Ruby stack handling

Michael Angelo Riverarequested to merge
fix/python-recursion-guards into main

Summary

  • add explicit low-stack bailouts for Python recursive parser and reference-resolution helpers
  • harden Ruby stack handling by guarding recursive expression extraction and growing the stack around Prism visitor traversal
  • add low-stack regression tests for the new Python and Ruby paths

Testing

  • cargo test -p parser-core bails_out_on_low_stack -- --nocapture
  • cargo test -p parser-core test_prism_visitor_grows_stack_on_low_stack -- --nocapture
  • cargo test -p parser-core test_expression_extraction_for_basic_use_cases -- --nocapture
  • cargo test -p parser-core test_context_tracking -- --nocapture

Related

Relates to #449 (closed)

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