[Fix] Make development checks portable to Windows

[alexwong10]

Why

The native Windows core checks fail on valid CLI output and a correctly closed static server. The smoke script compares CRLF output as if it were LF, the lifecycle tests expect closed-port connections to raise ConnectionRefusedError instead of timing out, and the invalid-home test assumes /dev/null is a special file.

How

Normalize the captured agent list before comparing it. Check the owned listening socket's closed descriptor directly, while retaining a real connection check during the session. Create a temporary regular file as the parent of an invalid S1A_HOME, which works on both Windows and Unix.

What

Keep Bash scripts and Git hooks at LF with .gitattributes. Add a Windows / Python 3.11 core CI job alongside the existing Linux / Python 3.11 and 3.13 jobs, select Bash for the smoke step, and document the Windows check commands.

Verification

On native Windows with CPython 3.11.16 and the locked core + dev dependencies:

• Full pytest -q: 482 passed, 41 skipped, with 66 subtests passed.
• scripts/smoke.sh: passed in Git Bash using native Windows Python, including its real CRLF output.
• ruff format --check ., ruff check ., ty check, uv lock --check --offline, and uv build --offline: passed.
• Reproduced both original lifecycle failures and the original smoke-list failure before editing. Temporarily omitting server_close makes both revised lifecycle tests fail, confirming that they still catch an unreleased socket.
• Verified that Git's checkout filters retain LF for the smoke script and both hooks with core.autocrlf=true.

[Yunaik]

thanks!