Adds three thin forwarding methods on TelegramEngine.Resources
(fetch, status, data) over MediaBox, then migrates SaveToCameraRoll's
three public functions to use them, drops import Postbox from the
module (source + Bazel dep), and updates all 23 call sites across 14
caller files atomically.
Bundled: spec + fix + plan + C1 facades + C2 SaveToCameraRoll rewrite
+ BUILD dep drop + CLAUDE.md outcome.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Isaac
Ilya Laktyushin