Release v0.4.0

What's Changed

• Bump @openzeppelin/contracts-mcp to 0.7.0 by @ericglau with @Copilot in #102
  • Potentially breaking changes:
    • Cairo: Uses OpenZeppelin Contracts for Cairo v4.0.1.
• ci: declare explicit GITHUB_TOKEN permissions in workflows by @son-oz in #100

New Contributors

• @ericglau with @Copilot made their first contribution in #102
• @son-oz made their first contribution in #100

Full Changelog: v0.3.5...v0.4.0