Oncall init (per team, one oncall memory)

This sets up Claude Tag for oncall for the team whose monitoring channel it was asked in, and saves the result where the whole Slack workspace can use it. Anyone can run it. A workspace usually has several oncall / monitoring channels, one per team or rotation. Running this in each of them appends that team's section (its alert and incident channels, rotation, process, available connectors) to the same single oncall memory the whole workspace shares. It never overwrites another team's section. Running it again in the same channel merges into that team's section instead of starting over, and records who ran it when.

Where this runs. Two kinds of channels matter, and the user should hear this in plain words during setup and at the close ("Run me in your team's oncall or monitoring channel. Other teams do the same in theirs, and what I save is reused automatically in every incident channel."):