fix(ci): remove stale squad-publish.yml that conflicts with publish.yml

Two workflow files both named 'Publish to npm' caused GitHub to resolve
the wrong one for workflow_dispatch. The stale squad-publish.yml triggered
on tag push with no workflow_dispatch support, blocking release automation.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: Copilot