feat: add outreach response tracking and goal follow-up system

[bokelley]

Summary

• Track DM responses to proactive outreach messages
• Track link click conversions when users sign up via outreach links
• Add goal follow-up job that sends gentle reminders for unanswered outreach (runs every 4 hours during business hours)
• Add goal outcome reconciliation (check if goals were achieved through other means like joining a working group)
• Add admin API endpoints for follow-up preview, reconciliation preview, and user timeline view
• Add follow_up_template, max_attempts, days_between_attempts to outreach_goals schema

Key Changes

Response Tracking

• bolt-app.ts: Detect and record DM/Assistant responses to outreach
• http.ts: Track conversions when users click login links from outreach

Goal Follow-Up Job

• New goal-follow-up.ts job that:
  • Sends follow-up messages for unanswered outreach (after configurable days)
  • Reconciles goal outcomes (e.g., if we invited someone to a WG and they later joined)
  • Runs every 4 hours during business hours (9am-6pm ET, weekdays)

Admin API

• GET /api/admin/outreach/follow-ups/preview - Preview pending follow-ups
• GET /api/admin/outreach/reconciliation/preview - Preview reconcilable goals
• POST /api/admin/outreach/follow-ups/run - Manually trigger job
• GET /api/admin/outreach/timeline/:slackUserId - View full outreach timeline for a user

Test plan

• Typecheck passes
• All existing tests pass
• Migration applies successfully (tested locally)
• Goal follow-up job starts and logs correctly
• Admin outreach page loads
• Manual testing of response tracking with real Slack DMs (post-deploy)
• Manual testing of follow-up messages (post-deploy)

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