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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>