Migrates uploadSecureIdFile's public signature from (context:,
postbox: Postbox, network: Network, resource: MediaResource) to
(context:, engine: TelegramEngine, resource: EngineMediaResource).
SecureIdVerificationDocumentsContext refactored to hold
engine: TelegramEngine instead of raw postbox + network, drops
import Postbox (tally +1). The one instantiation site in
SecureIdDocumentFormControllerNode updates to pass
engine: self.context.engine.
Completes the last explicitly-named future-wave candidate from
CLAUDE.md.
Bundled: spec + plan + C1 atomic migration + CLAUDE.md outcome.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>