- Reply-cycle auto-advance: staff reply files the thread to "Awaiting Reply",
a customer response files it to "Needs Response" (new GMAIL_LABEL_AWAITING_REPLY
/ GMAIL_LABEL_NEEDS_RESPONSE labels + autoAdvanceFolder, which only moves
threads still in the auto-cycle and leaves hand-filed folders alone)
- /forward: forward a ticket's email to another address (handlers/commands/forward.js
+ forward composition in services/gmail.js)
- Tests for the auto-advance cycle; label fixtures updated for the new labels
