Release v0.3.1

[devin-ai-integration]

Release v0.3.1

This PR bumps the version from 0.3.0 to 0.3.1 and updates the changelog with recent improvements and fixes.

Changes

Fixed

• Fixed posterior probability calculation with proper signal vs noise hypothesis differentiation
• Fixed clippy warnings and formatting issues for CI compliance

Changed

• Implemented conservative negative binomial parameter estimation for improved statistical modeling
• Updated repository description
• Applied code formatting improvements

Files Modified

• Cargo.toml: Version bump from 0.3.0 to 0.3.1
• CHANGELOG.md: Added new version entry with changes since 0.3.0
• Cargo.lock: Updated automatically with new version

Release Process

This PR follows the documented release process in RELEASE.md. After merging, a tag should be created to trigger the automated release workflow that builds binaries and publishes Docker images.

Testing

• Code builds successfully with cargo build
• Clippy checks pass with cargo clippy -- -D warnings
• Formatting is correct with cargo fmt --check

---

Link to Devin run: https://app.devin.ai/sessions/1fdc14dff2b843cba2ab9232d8620eac

Requested by: Jake VanCampen (jake.vancampen7@gmail.com)

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