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gstack-pregate --base <sha> refused with "fix: git fetch origin <sha> --depth=1". That fetch can never create origin/<sha>: a short SHA fails with "couldn't find remote ref", and a full SHA only reaches FETCH_HEAD. A fork clone hits the same wall with --base upstream/main. When origin/<base> does not resolve but <base> names a commit here and no local branch (a SHA, a tag, another remote's ref), the refusal now says --base takes a branch name on origin and suggests origin/HEAD's branch. A local branch, or a name that resolves nowhere, keeps the fetch fix: that is the unfetched or shallow checkout it repairs. Same code, same exit 3, and pin files are still read only from the reviewed origin/<base>. Fixes #3269 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>