refactor(data): retire legacy TaskStatus values and backfill existing rows

Slice 6 of the worker state and queue consolidation refactor.

* Drop Manual, Planning, Planned, Draft, Waiting from the TaskStatus enum
  and from the EF value converter; only the lifecycle values remain
  (Idle, Queued, Running, Done, Failed, Cancelled).
* Add migration RetireLegacyTaskStatus that rewrites existing rows:
  manual/draft -> idle, planning -> idle+planning_phase=active,
  planned -> idle+planning_phase=finalized, waiting -> queued+blocked_by
  derived from sort_order via a CTE with LAG().
* Reroute every call site that compared/set legacy values to the new
  three-field model (Status + PlanningPhase + BlockedByTaskId), including
  the planning repo helpers, MCP services, the planning chain coordinator,
  and the UI view-models. TaskRowViewModel now exposes PlanningPhase to
  drive the planning badge.
* Refresh Worker/CLAUDE.md and Data/CLAUDE.md, the docs/plan.md status
  section, and the planning verification notes in docs/open.md.

src/ClaudeDo.Worker/Planning/PlanningChainCoordinator.cs

@@ -39,16 +39,10 @@ public sealed class PlanningChainCoordinator
         if (children.Count == 0)
             throw new InvalidOperationException("Parent has no subtasks.");
 
-        // Eligibility: new layout uses Status=Idle. Tolerate legacy Manual/Planned/Draft
-        // values during this slice — they will be migrated away in slice 6.
-        var bad = children.FirstOrDefault(c =>
-            c.Status != TaskStatus.Idle &&
-            c.Status != TaskStatus.Manual &&
-            c.Status != TaskStatus.Planned &&
-            c.Status != TaskStatus.Draft);
+        var bad = children.FirstOrDefault(c => c.Status != TaskStatus.Idle);
         if (bad is not null)
             throw new InvalidOperationException(
-                $"Child {bad.Id} is in status {bad.Status}; expected Idle (or legacy Manual/Planned/Draft).");
+                $"Child {bad.Id} is in status {bad.Status}; expected Idle.");
 
         // Worker queue picker requires the "agent" tag — attach it so children are pickable.
         var agentTag = await ctx.Tags.FirstOrDefaultAsync(t => t.Name == "agent", ct);

src/ClaudeDo.Worker/Planning/PlanningMcpService.cs

@@ -49,7 +49,7 @@ public sealed class PlanningMcpService
         var child = await _tasks.CreateChildAsync(ctx.ParentTaskId, title, description, tags, commitType, cancellationToken);
         await BroadcastTaskUpdatedAsync(child.Id, cancellationToken);
         await BroadcastTaskUpdatedAsync(ctx.ParentTaskId, cancellationToken);
-        return new CreatedChildDto(child.Id, "Draft");
+        return new CreatedChildDto(child.Id, child.Status.ToString());
     }
 
     [McpServerTool, Description("List all child tasks under the current planning session's parent task.")]
@@ -68,9 +68,9 @@ public sealed class PlanningMcpService
     }
 
     private static readonly TaskStatus[] EditableStatuses =
-        { TaskStatus.Draft, TaskStatus.Idle, TaskStatus.Manual, TaskStatus.Queued };
+        { TaskStatus.Idle, TaskStatus.Queued };
 
-    [McpServerTool, Description("Update a child task in the active planning session. Can change title, description, tags (replaces the full set), commit type, and status. Status must be one of: Draft, Idle, Manual, Queued.")]
+    [McpServerTool, Description("Update a child task in the active planning session. Can change title, description, tags (replaces the full set), commit type, and status. Status must be one of: Idle, Queued.")]
     public async Task<ChildTaskDto> UpdateChildTask(
         string taskId,
         string? title,
@@ -97,7 +97,7 @@ public sealed class PlanningMcpService
             if (!Enum.TryParse<TaskStatus>(status, ignoreCase: true, out var parsed))
                 throw new InvalidOperationException($"Unknown status '{status}'.");
             if (!EditableStatuses.Contains(parsed))
-                throw new InvalidOperationException($"Status '{parsed}' cannot be set via MCP. Allowed: Draft, Idle, Manual, Queued.");
+                throw new InvalidOperationException($"Status '{parsed}' cannot be set via MCP. Allowed: Idle, Queued.");
             newStatus = parsed;
         }
 

src/ClaudeDo.Worker/Planning/PlanningSessionManager.cs

@@ -81,8 +81,9 @@ public sealed class PlanningSessionManager
             ?? throw new InvalidOperationException($"Task {taskId} not found.");
         if (task.ParentTaskId is not null)
             throw new InvalidOperationException("Cannot start a planning session on a child task.");
-        if (task.Status != TaskStatus.Manual)
-            throw new InvalidOperationException($"Task is in status {task.Status}; only Manual can start planning.");
+        if (task.Status != TaskStatus.Idle || task.PlanningPhase != PlanningPhase.None)
+            throw new InvalidOperationException(
+                $"Task is in status {task.Status}/{task.PlanningPhase}; only Idle+None can start planning.");
 
         var list = await lists.GetByIdAsync(task.ListId, ct)
             ?? throw new InvalidOperationException($"List {task.ListId} not found.");
@@ -232,7 +233,7 @@ public sealed class PlanningSessionManager
         var (tasks, _, settings, ctx) = CreateRepos();
         await using var __ = ctx;
         var children = await tasks.GetChildrenAsync(taskId, ct);
-        return children.Count(c => c.Status == TaskStatus.Draft);
+        return children.Count(c => c.Status == TaskStatus.Idle);
     }
 
     public async Task DiscardAsync(string taskId, CancellationToken ct)
@@ -261,8 +262,9 @@ public sealed class PlanningSessionManager
 
         var task = await tasks.GetByIdAsync(taskId, ct)
             ?? throw new InvalidOperationException($"Task {taskId} not found.");
-        if (task.Status != TaskStatus.Planning)
-            throw new InvalidOperationException($"Task is in status {task.Status}; resume requires Planning.");
+        if (task.PlanningPhase != PlanningPhase.Active)
+            throw new InvalidOperationException(
+                $"Task planning phase is {task.PlanningPhase}; resume requires Active planning.");
         if (string.IsNullOrEmpty(task.PlanningSessionId))
             throw new InvalidOperationException("No Claude session ID captured yet; cannot resume.");
 

src/ClaudeDo.Worker/Planning/PlanningTokenAuth.cs

@@ -27,7 +27,7 @@ public sealed class PlanningTokenAuthMiddleware
 
         var token = auth.Substring("Bearer ".Length).Trim();
         var parent = await tasks.FindByPlanningTokenAsync(token, ctx.RequestAborted);
-        if (parent is null || parent.Status != ClaudeDo.Data.Models.TaskStatus.Planning)
+        if (parent is null || parent.PlanningPhase != ClaudeDo.Data.Models.PlanningPhase.Active)
         {
             ctx.Response.StatusCode = 401;
             await ctx.Response.WriteAsync("Invalid or expired planning token");