Self-update mechanism for the Gram CLI

The Gram CLI now includes a built-in gram update command that provides a seamless self-update mechanism. Keep the CLI up to date without needing to reinstall or manage package versions manually.

# Check for updates without installing
gram update --check
 
# Update to the latest version
gram update
 
# Force reinstall even if already on the latest version
gram update --force

The --check flag performs a dry-run, displaying available updates without applying them. The --force flag reinstalls the CLI even when already running the latest version, useful for repairing installations or ensuring a clean state.

Features

• Add gram update command to check for and apply CLI updates automatically
• Add Pinecone example demonstrating a movie search tool using Gram Functions
• Redesign the login page with an interactive two-window demo featuring real data querying
• Add Snowflake example showcasing Gram Functions with Snowflake database integration
• Add PDF reader example demonstrating file reading from Google Cloud Storage
• Implement chat usage tracking in Polar for model-based analytics

Fixes

• Fix issues with the dev script for Gram Functions development
• Correct a regression affecting process.env usage in functions
• Fix .mcpb format packaging and Cursor deep link URL encoding
• Restore auto-close behavior for source dialogs in the dashboard
• Wrap long environment variable names in the Playground auth tab
• Fix Moonshine button functionality and various UI issues