feat(core): return RefreshResult from ContextBridge.refresh()

Surfaces provider errors through RefreshResult.errors instead of
silently ignoring them.

Co-authored-by: Ona <no-reply@ona.com>

packages/aris-core/src/index.ts

@@ -12,6 +12,7 @@ export type { DataSource } from "./data-source"
 export type { ContextProvider } from "./context-provider"
 
 // Context Bridge
+export type { ProviderError, RefreshResult } from "./context-bridge"
 export { ContextBridge } from "./context-bridge"
 
 // Reconciler