fix: Get meeting attendee emails from users table

[bokelley]

Summary

• Fixed calendar invites not being sent for scheduled meetings
• The working_group_memberships.user_email field is often NULL because it's not always populated when members are added
• Updated the query to join with the users table to get the actual email, with fallback to cached value

Problem

When Addie scheduled a meeting:

• ✅ Meeting created in database
• ✅ 5 members invited
• ❌ Calendar event created with attendeeCount: 0

The query was using working_group_memberships.user_email which was NULL for all members.

Solution

Changed the query to:

SELECT
  wgm.workos_user_id,
  COALESCE(u.email, wgm.user_email) as email,
  COALESCE(u.first_name || ' ' || u.last_name, wgm.user_name) as name
FROM working_group_memberships wgm
LEFT JOIN users u ON u.workos_user_id = wgm.workos_user_id
WHERE ...

Test plan

• Schedule a meeting with Addie
• Verify attendees have emails in the log output
• Verify calendar invites are sent

🤖 Generated with Claude Code