Use Ty's strictest recommended configuration

[adamtheturtle]

Summary

• enable Astral's strictest recommended Ty rules and analysis semantics
• enable the recommended Ruff ANN, PYI, and PGH003 families
• keep preview rules explicit so existing select-all configurations do not activate unrelated preview diagnostics
• narrow straightforward typed collections and use diagnostic-specific Ty suppressions at intentionally untyped framework/data boundaries

Configuration reference: https://docs.astral.sh/ty/coming-from-mypy-or-pyright/#recommended-configuration

Validation

• ty check
• ruff check .
• full pre-commit hook suite