Round six, and the upstream-parsing ambiguity dies at the root: @{u} is
now resolved via rev-parse --symbolic-full-name, where refs/heads/...
IS a local upstream and refs/remotes/<r>/... IS remote-tracking. The
previous remote-membership heuristic still misread a local feature/foo
upstream when a remote literally named "feature" existed. The
adversarial test now configures exactly that remote and passes.
Prepared with AI assistance (Claude Code), directed by @pbakaus.
Co-Authored-By: Claude Code <noreply@anthropic.com>