/resume

Resume a paused or backlog increment

# Resume Increment Command

**Usage**: `/sw:resume <increment-id>`

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## Purpose

Resume a paused or backlog increment when:
- **From Backlog**: Ready to start planned work
- **From Paused**: Blocker resolved (API keys arrived, approval granted)
- **From Paused**: Ready to continue after deprioritization
- **From Paused**: Prerequisite completed (can now proceed)

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## Behavior

1. **Validates** increment exists and is "paused" or "backlog"
2. **Calculates** pause/backlog duration (days, hours)
3. **Updates** metadata.json:
   - `status`: "paused" or "backlog" → "active"
   - Clears `...