Fix package name normalization to handle dots in addition to hyphens

[Copilot]

Problem

Package names with dots (e.g., jaraco.functools) were not being normalized correctly according to PEP 503, causing searches to fail when users tried both naming conventions. For example:

# This would work
avail_wheels jaraco_functools

# But this would not find the same packages
avail_wheels jaraco.functools

The issue was that the package name canonicalization in wild_requirements.py only replaced hyphens with underscores, but didn't handle dots, which should also be normalized to underscores per PEP 503.

Solution

Updated the package name normalization logic to replace both dots and hyphens with underscores:

# Before
self.name = req.name.replace("-", "_").lower()

# After  
self.name = req.name.replace("-", "_").replace(".", "_").lower()

This ensures that all of these package name variations normalize to the same canonical form:

• jaraco.functools → jaraco_functools
• jaraco-functools → jaraco_functools
• jaraco_functools → jaraco_functools

Testing

• Added comprehensive test test_package_name_normalization_dots_and_underscores() to verify the fix
• Updated existing tests to reflect the correct normalization behavior
• Verified that both naming conventions now work identically through manual testing

Impact

This change improves user experience by allowing both common package naming conventions to work correctly, while maintaining full backward compatibility. The fix follows Python packaging standards (PEP 503) and ensures consistent behavior across the tool.

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