Adds runtime deps (playwright, mitmproxy, anthropic, genson) and dev
deps (pytest, pytest-asyncio); creates the tests/ scaffold with
fixture_site.py, conftest.py, and a smoke test. Documents the
mitmproxy aioquic/mitmproxy-rs stub workaround needed for
free-threaded CPython 3.14.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Set up project scaffolding with free-threaded Python 3.14, uv for package
management, and Nix flakes for dev tooling (treefmt-nix with nixfmt/ruff,
pyright strict mode, direnv integration).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
tomatocream