feat: add conservative topology history fallback

src/facade/index.ts

@@ -8,6 +8,8 @@ export type { ApplyPlacementInput, BitBybitViewportAdapter, BitBybitWebCadFacade
 export { createEdgeSubshapeRefs, createSubshapeRefs, createVertexSubshapeRefs, matchSubshapes, signatureForEdge, signatureForFace, signatureForVertex } from './topologyNaming'
 export { createPersistedTopoRef, migrateTopoRefs, parseTopoRef, resolveTopoRef, serializeTopoRef } from './topologyReferences'
 export type { PersistedTopoRef, TopoRefResolution, TopologyMigration } from './topologyReferences'
+export { captureSignatureTopologyHistory } from './topologyHistory'
+export type { TopologyHistoryEntry, TopologyHistoryRelation, TopologyHistoryResult } from './topologyHistory'
 export { BasicSketchSolverAdapter, cloneSketch, createSketch, solveSketch } from './sketcher'
 export type { SketchConstraint, SketchDiagnostic, SketchGeometry, SketchPoint, SketchPointRef, SketchSnapshot, SketchSolveOptions, SketchSolveResult, SketchSolverAdapter, SketchSolverStatus } from './sketcher'
 export { createFacadeGeometryRecomputeExecutor, executeFacadeRecomputeNode, RecomputeCoordinator } from './recomputeEngine'