Slice 4 of the worker state consolidation refactor. Eliminates the
"queue never picks up planning tasks" bug structurally by routing both
the manager and MCP finalize paths through TaskStateService and
PlanningChainCoordinator.SetupChainAsync, where the auto-wake on enqueue
guarantees the queue picker claims the first child immediately.
- Delete TaskRepository.FinalizePlanningAsync; PlanningSessionManager
now orchestrates via _state.FinalizePlanningAsync + _chain.SetupChainAsync.
- Rename QueueSubtasksSequentiallyAsync to SetupChainAsync (internal);
layout is now Status=Queued + BlockedByTaskId, with auto-attached agent tag.
- OnChildFinishedAsync looks up the successor by BlockedByTaskId, drops
the legacy Waiting status lookup.
- PlanningMcpService.Finalize routes through state+chain; EditableStatuses
drops Waiting and adds Idle; gate uses PlanningPhase==Active.
- TaskStateService.FinalizePlanningAsync clears the planning session token.
- UI: TaskRowViewModel adds BlockedByTaskId; IsQueued/IsWaiting reflect
the new layout; TasksIslandViewModel.RemoveFromQueueAsync clears
BlockedByTaskId on dequeue.
- New regression test PlanningEndToEndTests.FinalizeAsync_FirstChildIs
ClaimedByPicker_WithinDeadline asserts the picker claims the first
child within 200ms with no manual WakeQueue.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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