Twinned from https://github.com/cfsh/ninefold/issues/625 by tools/beads/import_github.py's reconcile pass.
spawn_dev.py only ever cuts a new branch from origin/main, so handing a live PR to a fresh session (as just happened for #553) has to go through --standing-slot plus a hand-written --kickoff-file — which is the transcription failure #557 existed to remove, returning through the escape hatch.
Wants a way to adopt the existing branch and generate the handover kickoff from the PR.
None.
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