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* feat(tasks): enforce sibling sequence order at the claim chokepoint A task with a parent and effective sequence N (COALESCE(sequence, 0)) can no longer be claimed while any sibling with a strictly lower effective sequence is non-terminal — assignee-blind, independent of and stricter than dependency_ids, enforced in _validate_claim_preconditions so both claim paths (gateway verbs and the dispatcher's raw REST claim) cross it. Ties run parallel; cancelled siblings never block; sequence 0 and parentless tasks are unaffected. Live failure this guards: a PM delegated revision subtasks sequenced 0..3 with no dependency edges and seq 2 started alongside seq 0 — sequence was advisory-only. set_sequence's contract updated accordingly. New e2e smoke case drives the refusal and the post-completion claim through the real gateway. * chore(scripts): skip .uv-cache and .claude in the prose scanner Repo-local tool dirs (private uv cache, agent worktrees) carry vendored and generated markdown that tripped make reflow-check. * fix(tasks): wave-derived delegation sequences + claim-gate hardening Three fixes from the adversarial review of the sequence claim gate: Delegation no longer stamps a raw per-sibling ordinal (deterministic merge-order bookkeeping) as sequence — under the strict gate that serialized ALL delegated work, including fully independent cross-dev and cross-cell siblings. Sequences are now wave-derived post-wiring (stamp_wave_sequence: 1 + max same-parent dependency sequence, 0 when independent), so independent siblings tie and run parallel while colliding/ordered work ascends. The cross-cell UX wiring restamps instead of writing relative ux+1 values (a relative write could invert a collision-derived stamp), and the dispatch merge/lane barriers gain a created_at tiebreak for wave-tied siblings so shared-branch merge order stays deterministic. PM-authored sequences are never rewritten. The guard now also fires on reclaims from needs_revision (a lower- sequence sibling delegated after the first claim was invisible), and tasks.parent_task_id gains an index (migration 069) — the guard's sibling probe ran as a Seq Scan on the hottest verb. --------- Co-authored-by: Renn F <rennf93@users.noreply.github.com>