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Runner stack (non-worktree path): IClaudeProcess + ClaudeProcess spawning the CLI with --output-format stream-json, prompt via stdin, parses the final type:"result" line into RunResult. LogWriter appends ndjson to ~/.todo-app/logs/<taskId>.ndjson. TaskRunner orchestrates DB transitions (MarkRunning -> MarkDone/Failed) and pushes TaskStarted/Message/Finished/ Updated via HubBroadcaster. Worktree-backed lists short-circuit with a "Slice E" failure message until git support lands. QueueService (BackgroundService) holds two in-memory slots (_queueSlot + _overrideSlot) guarded by a lock. Uses PeriodicTimer + SemaphoreSlim wake signal so WakeQueue() triggers an instant pickup. RunNow throws InvalidOperationException when override busy; CancelTask cancels the linked CTS which kills the child process tree. WorkerHub extended with GetActive, RunNow (translated to HubException variants), CancelTask, WakeQueue. HubBroadcaster exposes typed push methods. Tests: 26 pass (12 new). QueueServiceTests cover override-busy, schedule-filter, FIFO sequentiality, cancellation, plus a FakeClaudeProcess that blocks on a TCS for deterministic slot-state assertions. MessageParserTests cover result extraction + malformed/non-result lines. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>