grep -E '^[^/.][^/]*/' matches ANY non-dot top-level folder in the
changed-files list, including deploy/ -- the shared tooling folder
synced by every deploy, not a stack. A PR touching only
deploy/envparse.py caused stack-deploy.sh to be invoked with "deploy"
as a stack name, which correctly errored ("No main compose file... in
.../deploy") since deploy/ has no deploy.yaml.
No live service was affected (the error occurs before any redeploy
attempt), but it produced a confusing FAIL on an otherwise-correct
change (PR #8) and could mask a real failure in the noise.
Adds `| grep -v '^deploy$'` after the folder-name extraction in all 5
places this pattern appears (validate, provision-secrets x2, deploy,
verify). deploy/ is already unconditionally rsynced at the top of the
deploy step regardless of which stacks changed, so excluding it from
the stack list is safe -- it will still be synced, just never treated
as a deployable stack.