feat: Add py.typed for PEP 561 type checking support
Added empty py.typed marker file to enable type checkers (mypy, pyright, pylance) to use inline type hints from the package. This file was declared in pyproject.toml package_data but was missing, causing build warnings. Benefits: - Enables type checkers to use inline type hints - Follows Python typing best practices (PEP 561) - Improves IDE autocomplete/intellisense Fixes #222 🤖 Generated with [Claude Code](https://claude.com/claude-code)
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