/backlog

Move an increment to backlog (planned but not ready to start)

# Backlog Increment Command

**Usage**: `/sw:backlog <increment-id> --reason="<reason>"`

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## Purpose

Move an increment to backlog when:
- **Planned** but not ready to start yet
- **Low priority** compared to other work
- **Waiting** for decisions or approvals before starting
- **Multiple ideas** you want to plan without violating WIP limits

**Key Difference**:
- **Backlog** = Never started, planned for future (does NOT count towards WIP)
- **Paused** = Started but blocked (does NOT count towards WIP)

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## Behavior

1. **Validates** increment exists and is "active"
2. **Prompts** ...