Add @mjademitchell as a contributor

[alexdewar]

Description

The @all-contributors bot didn't work, so I've opened a PR for this manually.

Type of change

• Bug fix (non-breaking change to fix an issue)
• New feature (non-breaking change to add functionality)
• Refactoring (non-breaking, non-functional change to improve maintainability)
• Optimization (non-breaking change to speed up the code)
• Breaking change (whatever its nature)
• Documentation (improve or add documentation)

Key checklist

• All tests pass: $ cargo test
• The documentation builds and looks OK: $ cargo doc
• Update release notes for the latest release if this PR adds a new feature or fixes a bug
  present in the previous release

Further checks

• Code is commented, particularly in hard-to-understand areas
• Tests added that prove fix is effective or that feature works

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.78%. Comparing base (f495718) to head (8648848).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1279   +/-   ##
=======================================
  Coverage   89.78%   89.78%           
=======================================
  Files          57       57           
  Lines        8205     8205           
  Branches     8205     8205           
=======================================
  Hits         7367     7367           
  Misses        542      542           
  Partials      296      296           

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[Copilot]

Pull request overview

This PR manually updates the all-contributors configuration and README to add @mjademitchell as a recognized contributor, since the all-contributors bot workflow didn’t apply the update automatically.

Changes:

• Bump the README all-contributors badge count from 10 to 11.
• Add mjademitchell to the contributors table in README.md.
• Append mjademitchell to .all-contributorsrc and update the “Add your contributions” usage link.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
README.md	Updates the all-contributors badge/count and adds the new contributor entry to the rendered contributors table.
.all-contributorsrc	Registers mjademitchell in the all-contributors config so future automated updates remain consistent.

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