[codex] Migrate type checking to ty

[jayhack]

Summary

• replace the mypy dev dependency, config, and workflow with Astral ty
• add project-level ty config scoped to packaged Python source and build hooks
• add Cython stubs for compiled sort/resolution/utils imports
• clean up wrapt decorator annotations so the touched decorator module passes ty
• update rust-rewrite handoff docs to reference ty instead of mypy

Validation

• uv lock --check
• uv run ty check --output-format=concise src/graph_sitter/core/autocommit/decorators.py src/graph_sitter/compiled/sort.pyi src/graph_sitter/compiled/resolution.pyi src/graph_sitter/compiled/utils.pyi
• uv run python -m py_compile src/graph_sitter/core/autocommit/decorators.py
• parsed pyproject.toml and .github/workflows/ty.yml
• git diff --check

Notes

A full configured ty check still reports inherited source type debt. The new workflow checks changed packaged Python source going forward rather than adding blanket ignores for the existing backlog.

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Project	Deployment	Actions	Updated (UTC)
graph-sitter	Ready	Preview, Comment	Jun 22, 2026 5:54pm