Class DefaultRuntimeActionBridgeBuilder

Default concrete RuntimeActionBridgeBuilder — registered with no key so any subclass registered later wins automatically via MJ's auto-priority tiebreak. Consumers that want to customize the bridge (for example, to add a new utilities.* namespace, tighten the default surface, or stub everything out for tests) just need to register their own subclass:

@RegisterClass(RuntimeActionBridgeBuilder)
export class MyBridge extends RuntimeActionBridgeBuilder {
  public override BuildHandlers(ctx: BridgeContext): BridgeHandlerMap { ... }
  public override GetPreamble(): string { ... }
}
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@memberjunction/actions calls ClassFactory.CreateInstance(RuntimeActionBridgeBuilder) and invokes these two methods each time a Runtime action with a bridge configuration runs. If nothing registers (e.g., this package isn't loaded), ActionEngine falls through to pure-compute mode — a safe degradation.