# SQ-013: Control Plane - Topic Management

**Status:** `[ ] TODO`
**Blocked by:** SQ-012
**Priority:** Medium

## Description

Implement the ControlPlane gRPC service for topic CRUD operations.

## Files to Create/Modify

- `crates/sq-server/src/grpc/control_plane.rs` - ControlPlaneService impl
- `crates/sq-storage/src/topic_metadata.rs` - topic registry (file-backed)
- `crates/sq-server/src/grpc/mod.rs` - register ControlPlane service

## Acceptance Criteria

- [ ] CreateTopic: creates topic with specified partitions and replication factor
- [ ] CreateTopic: duplicate name returns AlreadyExists
- [ ] ListTopics: returns all created topics
- [ ] DescribeTopic: returns partition info with earliest/latest offsets
- [ ] DeleteTopic: removes topic from registry
- [ ] Publish to deleted topic: returns NotFound
- [ ] Topic metadata persists across server restarts