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Three coupled claim-path bugs from the 2026-07-24 live incident, fixed at the shared root: - The edge-agnostic sequence bar phantom-held a task behind an unrelated, never-connected same-parent sibling that coincidentally shared a lower raw sequence (stamp_wave_sequence stamps from a partial per-task view). _claim_blocked_by_sequence now branches on is_batch_root_subtask: a MegaTask root-subtask (globally-computed Kahn wave, a deliberate staged-release barrier) keeps the strict rule unchanged; every other same-parent context routes through the pure sequence_blocker_id, which only blocks on a real transitive predecessor via dependency_ids UNIONED with completed_dependency_ids. A task with no same-parent dependency edge at all falls back to the raw bar unchanged (#452 preserved). - The hold surfaced as claim()'s bare None and was misdiagnosed by the verb runner as a concurrent-transition invalid_state. New sequence_hold_reason + a proactive _sequencing_claim_guard return a dedicated Envelope.sequence_held naming the blocker, on both the PENDING and NEEDS_REVISION reclaim paths. - give_me_work offered tasks the claim gate then rejected: both offer paths (list_pending_for_agent, _drop_dependency_held) now consult the bar via the exact claim predicate (is_pending_claim_blocked, extended to NEEDS_REVISION). Co-authored-by: Renn F <rennf93@users.noreply.github.com>