Slack Bot - `/postjob`

Description

**THE VIRAL LOOP:**
```
Team discusses task in Slack
→ Someone types /postjob
→ Bot opens modal for details
→ Job posted
→ Team notified of progress
→ Entire team learns about marketplace
```

**Why This Works:**
- Slack = team communication hub
- Discussions → jobs is natural flow
- Whole team exposed to marketplace

**Deliverables:**
1. Slack app with `/postjob` command
2. Modal for job details
3. Channel notifications for updates
4. OAuth for team installation

**PUBLISHED TO:**
- Slack App Directory
- App categories: Productivity, Developer Tools

**Success Metrics:**
- 50+ teams install
- Team-based adoption pattern emerges