Feature: use ty for type-checking by default + remove pylint

[krishan711]

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[Copilot]

Pull request overview

This PR updates the project’s dev tooling defaults by removing the pylint-based linting path and switching the default type-checker from mypy to ty, along with dependency and Makefile updates to reflect the new workflow.

Changes:

• Update lint-check to use Ruff exclusively and remove the --new mode/pylint integration.
• Make ty the default type-checker (with an opt-in --mypy flag).
• Refresh tool dependencies in pyproject.toml and update Makefile targets accordingly.

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
pyproject.toml	Updates Python/version constraints and tool dependencies (adds ty, removes pylint, bumps versions).
makefile	Removes --new usage and aligns lint targets with the new CLI.
CHANGELOG.md	Documents the removal of pylint and the switch to ty by default.
buildpy/type_check.py	Adds ty parsing/execution as default; retains mypy behind a flag.
buildpy/lint_check.py	Removes pylint code-path and runs Ruff check/format consistently.

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