Handle Gmail reply-based scheduling with Google Calendar and GPT-4o-mini

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Reply Handling (Optional Extension) This optional workflow handles email replies after availability options have been sent. It extends the main scheduling flow by enabling two-way, email-based confirmation. What this extension does Listens for user replies via Gmail Normalizes free-text replies into structured data Detects whether the user confirmed a proposed slot or requested alternatives Automatically creates a Google Calendar event on confirmation Sends a confirmation or follow-up em