Initial release of clawdbot-release-check.

• Checks for new clawdbot releases on GitHub and notifies you once per new version.
• Supports daily update checks via cron with Telegram notifications.
• Includes commands to check status, force notification, show highlights from all missed releases, reset state, and display help.
• Caches release data and highlights to reduce API calls and avoid repeated notifications.
• Easily configurable via environment variables for source path and cache duration.