Modernize project: migrate to pyproject.toml and refactor IPC#7

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ei-grad wants to merge 3 commits intomasterfrom

claude/review-project-setup-2mIlp

Commits on Feb 9, 2026

Modernize project for 2026: pyproject.toml, fix resource leaks, update docs
claude
committed
Fix CI: upgrade actions/setup-python to v6 for Python 3.14 support
claude
committed
Address Copilot review: fix spawn compat, error reporting, pipe cleanup
claude
committed