appgate_upload no longer requires app_id. Without it the action calls
POST /api/releases with the org key (agk_...) and lets the server find
or create the app by bundle_id + platform. Platform is detected from the
file extension (or set via `platform`), bundle id is read with the
app-info gem (or set via `bundle_id`); `app_name` is passed through.
A 409 lists the matching app ids and asks for app_id. The app_id path
is unchanged. Status polling now surfaces the server's `error` field.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>