A task blocked before it was ever claimed (a dependency-gated claim that got
escalated) has no branch. Legacy unblock() forced in_progress, which the
dispatcher refuses (state=in_progress but branch_name unset) -> a spawn-refused
loop. Add the blocked->pending transition and route no-branch tasks there so
they are freshly claimed (the claim gate then holds them cleanly while the
dependency is unmet). Branched tasks still resume in_progress. Artifacts
regenerated.
Renn F
2631f2647c