docs(workflows): document GitHub-family assumption in wrap-it-up Step 3.5

Step 3.5's Linear ticket-state sweep uses gh to find the merged PR for a Dev-Review ticket, which assumes a GitHub-family host. That holds today because DeepSat, the only Linear-using project, lives on GHE where gh talks to the API.

I added a note flagging the assumption rather than rewriting the step to be provider-agnostic. A future Linear project on GitLab, Gitea, or Bitbucket would need a different PR lookup, but none exists yet, so documenting the boundary beats building for a host we don't have.

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