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A branch_name set on a task was treated as proof the ref existed on origin, so _finalize_claim skipped _ensure_branch_for_task and create_branch/push never ran. A manual field write (or a prior failed create_branch whose rollback didn't restore branch_name) left the field set while the branch was never pushed; descendants then ls-remote'd the name, found it empty, and cut from master via create_branch's silent fallback — breaking the cell->root branch hierarchy (MegaTask f7d0a61a root-branch 404). Defect A: - _ensure_branch_for_task trust-but-verifies a pre-set branch_name: probe origin, and when the ref is confirmed missing run the full create to push it. An inconclusive probe (network error) fails soft so a transient glitch can't fail a normal resume claim. Gated on project_id so branchless coordination/umbrella tasks are untouched. - _finalize_claim always runs _ensure_branch_for_task (the single chokepoint that ensures the branch exists) and snapshots+restores branch_name on rollback, so a failed first attempt can't leave the field half-set and short-circuit a retry. - GitService.branch_exists_on_remote: ls-remote probe returning True (present) / False (absent) / None (probe errored, fail soft).