2.0.0

What's Changed

• Upgrade to .NET 8 and harden Poly1305 API/security behavior by @TimothyMeadows in #1
• Fix RFC vector tests by preserving MAC bytes before pinned buffer disposal by @TimothyMeadows in #2
• docs: expand README with full usage and API guidance by @TimothyMeadows in #3
• Update README style by @TimothyMeadows in #4

Full Changelog: 1.0.0...2.0.0