feat(planning): prevent orphaned subtasks via guards + startup repair
Three coordinated guards close the orphan-creation paths: - CreateChildAsync refuses when the parent is not in a planning phase. - DiscardPlanningAsync now returns a structured DiscardPlanningOutcome and refuses when children are queued or running; callers can opt into auto-dequeuing queued kids via dequeueQueuedChildren=true. Terminal children (Done/Failed/Cancelled) are promoted to top-level instead of becoming orphans when the parent's PlanningPhase is reset. - OrphanRecovery hosted service clears ParentTaskId on any rows whose parent is missing or no longer in a planning phase on worker startup, mirroring the StaleTaskRecovery pattern. UI surfaces the block reason: a confirm dialog offers to dequeue queued children and retry; a running-children block is shown as a hard error asking the user to cancel first. WorkerClient now negotiates the JsonStringEnumConverter so the DiscardPlanningResult enum round-trips correctly over SignalR. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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@@ -217,7 +217,7 @@ public sealed class PlanningSessionManagerTests : IDisposable
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var startCtx = await _sut.StartAsync(parent.Id, CancellationToken.None);
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Assert.True(Directory.Exists(startCtx.Files.SessionDirectory));
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await _sut.DiscardAsync(parent.Id, CancellationToken.None);
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await _sut.DiscardAsync(parent.Id, dequeueQueuedChildren: false, CancellationToken.None);
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Assert.False(Directory.Exists(startCtx.Files.SessionDirectory));
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var loaded = await _tasks.GetByIdAsync(parent.Id);
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@@ -235,7 +235,7 @@ public sealed class PlanningSessionManagerTests : IDisposable
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var ctx = await _sut.StartAsync(parent.Id, CancellationToken.None);
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Assert.True(Directory.Exists(ctx.WorktreePath));
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await _sut.DiscardAsync(parent.Id, CancellationToken.None);
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await _sut.DiscardAsync(parent.Id, dequeueQueuedChildren: false, CancellationToken.None);
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Assert.False(Directory.Exists(ctx.WorktreePath));
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// branch deleted
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