Round-five bot findings, one real root cause: splitRemoteRef treated the
first slash in any ref as a remote separator. A local upstream named
release/2.0 was truncated to "2.0", and feature/foo tracking from branch
foo collapsed to the current branch's own name and was self-skipped,
discarding a valid base both times.
The split now happens only when the prefix names a configured remote;
otherwise the whole ref is one local branch name. The per-remote HEAD
symref loop strips its own queried prefix directly (that remote may be
fabricated in tests or partial clones without appearing in git remote).
The reported pruned-upstream shape already resolves via the multi-remote
rev lists from the previous round; its test now guards that.
Prepared with AI assistance (Claude Code), directed by @pbakaus.
Co-Authored-By: Claude Code <noreply@anthropic.com>
Paul BakausandClaude Code
f89b6c10b1