Add integration tests for the Gas Town hub+spokes topology where:
- Hub (mayor rig) runs dolt sql-server with remotesapi
- Spokes (crew clones) configure hub as their only peer
- Data flows through hub in star topology
Tests included:
- TestHubSpokes_MultiCloneSync: Basic two-spoke convergence
- TestHubSpokes_WorkDispatch: Hub dispatches work, spokes complete it
- TestHubSpokes_ThreeSpokesConverge: Three-spoke convergence test
Note: These tests follow the same pattern as peer_sync_integration_test.go
and document current behavior including the no common ancestor limitation
that affects cross-database sync.
Closes bd-phwci
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>