Avoid stack overflow on drop of deep AST

[samuelcolvin]

uses #25480

Summary by cubic

Prevents stack overflow when dropping very deep Python ASTs by severing recursive edges before drop. Deeply nested expressions now return a safe “Source is too deeply nested” error instead of crashing.

• Bug Fixes

  • Avoid recursive drops by using mem::replace on BinOp, Call, Subscript, and Attribute, with placeholders to vacate owned fields.
  • Added helpers: deconstruct_subscript, deconstruct_attribute, placeholder_expr, placeholder_arguments.
  • Added many_plus test to stress deep binary chains; both this and deep attribute access now fail safely with the expected error.

• Dependencies

  • Bumped ruff_* and ty_* crates (e.g., ruff_python_parser, ruff_python_ast, ruff_text_size, ruff_db, ty_python_semantic, ty_python_core, ty_module_resolver, ty_vendored) to the latest revision.

^{Written for commit 8d0092d. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 4 files

_{Re-trigger cubic}

[codspeed-hq]

Merging this PR will not alter performance

✅ 17 untouched benchmarks
⏩ 15 skipped benchmarks¹

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_{Comparing drop-bomb (8d0092d) with main (4cae078)}

Footnotes

1. 15 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[github-actions]

Codecov Results 📊

❌ Patch coverage is 77.05%. Project has 24059 uncovered lines.
✅ Project coverage is 66.39%. Comparing base (base) to head (head).

Files with missing lines (1)

File	Patch %	Lines
crates/monty/src/parse.rs	77.05%	⚠️ 14 Missing and 3 partials

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
+ Coverage    66.36%    66.39%    +0.03%
==========================================
  Files          281       281         —
  Lines        71521     71573       +52
  Branches    153638    153776      +138
==========================================
+ Hits         47460     47514       +54
- Misses       24061     24059        -2
- Partials      4067      4066        -1

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Generated by Codecov Action

[codecov]

Codecov Report

❌ Patch coverage is 90.16393% with 6 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
crates/monty/src/parse.rs	90.16%	0 Missing and 6 partials ⚠️

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