Sends a daily Discord digest of new public vals from Val Town. It grabs previews of READMEs when it exists. When there's no README, it will send the code to GPT-4o for a summary.

• main.tsx - Main cron function and Discord webhook
• fetch-vals.ts - Fetches and filters new vals using Val Town SDK
• database.ts - DB queries
• ai-summarizer.ts - Generates OpenAI summaries for vals without READMEs
• [test] scratch.ts - Just for clearing SQLite DB during testing

• Filter out vals that start with "untitled-" (auto-generated names), blank vals with no files, or vals with an empty main.tsx
• Skip READMEs that only contains a single header (e.g., "# My Project" with nothing else)
• Filter out commonly remixed val names like Blob Admin, SQLiteExplorer since we don't have a public API to check shallow remixes (remixes with few version edits).
• Prioritize main.tsx files for AI summaries and limit code sent to OpenAI to 5KB to avoid token limits (and $$ cost)
• Store hashes of READMEs in a SQLite DB to avoid getting notified about repeat vals - again, because we don't have a public API to check if it's a shallow remix yet.

1. Set DISCORD_WEBHOOK environment variable
2. Set OPENAI_API_KEY environment variable
3. Set testMode = false in main.tsx for production