alefsolutions/openclaw-google-calendar ? reverse-engineered prompt

Build me an OpenClaw plugin for Google Calendar that I can use locally in my own setup.

I want it to let OpenClaw handle the main calendar stuff I do every day, like connecting my Google account, creating events, finding upcoming meetings, updating or deleting events, and answering things like what is my next meeting. If I ask something vague, it should ask me to clarify before doing anything risky, and it should be able to handle missing details like date, time, attendees, location, or timezone.

Please make it work as a real plugin package, not just a loose script, with configuration from the plugin settings and environment variables. It should support a simple auth flow for Google Calendar and include safe handling for tokens and defaults like calendar id and timezone. If anything is unclear in the current docs, look up the latest OpenClaw and Google Calendar API details online and wire it up in a practical way.