Common utility functions.

• email.utils.ts - Email processing utilities (filename parsing, interviewee name extraction)
• pdfExtractor.ts - PDF text extraction utilities
• process-timing.utils.ts - Process timing calculations and formatting utilities
• notion-properties.utils.ts - Notion property creation and formatting utilities
  • createTotalQuestionsProperty(count) - Creates number property for total questions count
  • createCompletedQuestionsProperty(count) - Creates number property for completed questions count
  • extractPageIdFromWebhook(webhookBody) - Extracts page ID from Notion webhook payload