Add release workflow

[mattt]

Linked Issue

Closes #7

Description

This PR adds a new GitHub Actions workflow that automatically creates a GitHub release with generated release notes whenever a semantically versioned tag is pushed.

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Refactoring (no functional changes)
• Performance improvement
• Test coverage improvement

Changes Made

• Adds a new release.yml workflow file

SPEC Compliance

• This PR implements/fixes spec compliance
• Spec section(s) affected:
• Spec version:

Testing

• All existing tests pass
• Added new tests for changes
• Tests cover edge cases and spec compliance

Pre-submission Checklist

• My code follows the project's coding standards
• I have run code formatting/linting tools
• I have added tests that prove my fix/feature works
• New and existing tests pass locally
• I have updated documentation if needed
• I have reviewed the TOON specification for relevant sections

Breaking Changes

• No breaking changes
• Breaking changes (describe migration path below)

Additional Context

[Copilot]

Pull request overview

This PR adds a GitHub Actions workflow to automate the release process. When a semantically versioned tag is pushed, the workflow creates a GitHub release with automatically generated release notes using the GitHub CLI.

Key Changes:

• Adds .github/workflows/release.yml workflow triggered by semantic version tags
• Configures appropriate permissions (contents: write) for release creation
• Uses GitHub CLI (gh release create) with auto-generated release notes

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[mattt]

I'm flabbergasted that this worked on the first try. Nice 👌