Update all license references from MPL-2.0 to MIT

[Copilot]

Description

Corrects license references throughout the repository. The project was initially created with MPL-2.0 but was switched to MIT before release. This PR updates documentation to match the actual LICENSE file.

Type of change

• Documentation update

How Has This Been Tested?

• Verified all MPL-2.0 references removed via grep
• Confirmed LICENSE file, .csproj, README.md, and copilot-instructions.md all reference MIT consistently

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

Screenshots (if applicable)

N/A - Documentation update only

Additional context

Changes:

• README.md: Updated license badge from MPL-2.0 to MIT
• README.md: Simplified license section, removed contradictory note about "older versions" declaring MIT

Verification:

• LICENSE file: MIT (unchanged)
• .csproj: <PackageLicenseExpression>MIT</PackageLicenseExpression> (unchanged)
• All references now consistent

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[Copilot]

Pull request overview

Updates repository documentation to consistently reference the MIT license (matching the existing LICENSE file) and removes outdated MPL-2.0 wording.

Changes:

• Updated the README license badge from MPL-2.0 to MIT.
• Rewrote the README license section to state MIT clearly and removed the prior contradictory note.