When a user quotes a file message (type=3) and @bot, the quote's desc field
only contains the filename without a ybres:// resource reference. The existing
QuoteContextMiddleware only extracted media refs from desc using the ybres regex,
which always returned empty for file quotes.
Fix: add a transcript lookup fallback in QuoteContextMiddleware.handle() —
when quote_media_refs is empty but reply_to_message_id is set, search the
session transcript for the quoted message_id and extract ybres anchors from
its content.
Also fix message_type classification: when quote media resolves non-image files,
override message_type to DOCUMENT so gateway/run.py's document injection logic
properly prepends the file path and content for the agent.
fc2754dbdf