remove pywinpty py315 CI kludge

[bckohan]

Do not merge this until pywinpty has a python 3.15 build.

[Copilot]

Pull request overview

This PR disables (by commenting out) the custom uv index/source override that was previously used to install a Windows/Python 3.15-compatible pywinpty build, while expanding the surrounding comments explaining why that override exists.

Changes:

• Expanded the explanatory comment describing the rationale for a custom pywinpty wheel/index for Python 3.15.
• Commented out the [[tool.uv.index]] entry for the custom pywinpty-py315 index.
• Commented out the [tool.uv.sources] mapping that directed Windows/Python>=3.15 to that custom index.

Suppressed comments (1)

pyproject.toml:75

• With the pywinpty index commented out, this uv sources mapping is also disabled, so uv will no longer pull the Windows/Python>=3.15 build from the custom index. If the intent is to keep CI green for the existing Windows 3.15 job, this mapping needs to remain active until an upstream wheel exists.

# [tool.uv.sources]
# pywinpty = [
#   { index = "pywinpty-py315", marker = "sys_platform == 'win32' and python_full_version >= '3.15'" },
# ]

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