Product QA Announcer

!IMPORTANT: The QA label must be applied on the linear issue create call itself. The product_bot listens to the Linear "issue created" event filtered by label — applying the label later with linear issue update does not re-fire the bot and the channel is never notified. Never split create-then-label.

!IMPORTANT: Draft and iterate in chat. Create the sub-issue only after explicit user approval.

Step 0: Parse arguments

Parse $ARGUMENTS:

• Strip --label <name> into LABEL (default: QA Produit). This is the label the bot keys on; it must already exist on the target team.
• The remainder, if any, is the PR reference.

Step 1: Resolve the PR