Postbox -> TelegramEngine wave 4: TelegramEngine.Stickers.uploadSticker
Migrates uploadSticker's public surface from (peer: Peer,
resource: MediaResource, thumbnail: MediaResource?, ...) to
(peer: EnginePeer, resource: EngineMediaResource,
thumbnail: EngineMediaResource?, ...), and UploadStickerStatus.complete
payload from CloudDocumentMediaResource to EngineMediaResource. Both
external call sites plus the cascading destructure and .standalone
sites inside MediaEditorScreen migrated atomically.
Bundled: spec + fix + plan + C1 atomic facade migration + CLAUDE.md
outcome + enum-payload inventory lesson added to wave-selection
guidance.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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