Add local media upload-and-send helpers with an optional Node file source
and stage-aware errors. Add explicit quoted replies and cancellable event
waits while preserving existing methods and handler contracts.
Propagate group-file publication failures instead of reporting success.
Cover cancellation, cleanup, signed message IDs, package exports, consumer
types, and real HTTP/WebSocket upload-to-send integration.
Validation: pnpm run ci (6231 tests passed, 9 skipped); SDK package contents
verified with npm pack --dry-run --ignore-scripts.
DrSmoothl
fa5efcd310