switch default branch master -> main

[bckohan]

No description provided.

[Copilot]

Pull request overview

Updates project metadata and documentation links/badges to reflect the default branch rename from master to main.

Changes:

• Updated the PyPI “Download” URL to use the main branch tarball.
• Updated documentation/README badges (Codecov + GitHub Actions) to track the main branch.
• Updated Sphinx theme “source_branch” setting to main.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
pyproject.toml	Points the “Download” project URL at the main branch tarball.
docs/index.rst	Updates badges/links to track coverage and CI status for main.
docs/conf.py	Updates Sphinx “source_branch” so source links point to main.
README.md	Updates badges/links to track coverage and CI status for main.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.78%. Comparing base (fc10d06) to head (a7061ba).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #875   +/-   ##
=======================================
  Coverage   95.78%   95.78%           
=======================================
  Files          28       28           
  Lines        1896     1896           
  Branches      273      273           
=======================================
  Hits         1816     1816           
  Misses         48       48           
  Partials       32       32           

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