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Add a FinalizeExport RPC to pass the combined exporter response back to the session provider after all exports complete. This lets clients run completion work while the build's gateway references remain available. Keep the callback optional for compatibility with existing session exporters. Ignore unsupported finalization, propagate callback failures, and support providers that only register a finalization callback. Signed-off-by: Alberto Garcia Hierro <alberto.hierro@docker.com>