Clarify native Windows support for the repo

[gbsierra]

Problem

The README says to run:

uv sync --extra dev
uv run ruff check .
uv run ruff format .
uv run ty check
uv run pytest -q

The docs do not say whether native Windows is supported.

On native Windows PowerShell, the pytest step fails with many errors:

51 failed, 1718 passed, 21 skipped, 12 warnings

On native Windows Git Bash, the pytest step also fails with many errors:

52 failed, 1717 passed, 21 skipped, 12 warnings

On VS Code Remote WSL Ubuntu, pytest passes:

1773 passed, 17 skipped, 1 warning

What Fails On Native Windows

Failures include:

• LocalBashEnv tests.
• Benchmark environment tests.
• Path and newline differences.
• Windows symlink or permission behavior.

Many failures appear related to Unix shell assumptions. This is not only a test issue:
LocalBashEnv is runtime code used by benchmark environments.

Decision Needed

repo should clarify the intended support

Either:

• Support native Windows and fix the failures, or
• Document whether native Windows supported or not

Done When

• Contributors know whether native Windows is supported.
• docs state the supported platform expectations.
• If native Windows is supported, the documented gate passes there.
• If native Windows is not supported, docs point Windows users to WSL.

Note

I can help with this once the intended direction is chosen