feat(worker,data): persist interactive session id so a closed/aborted ConPTY session can be resumed

Generates the claude session id up front (--session-id <guid>) for a fresh interactive task
session and persists it to TaskEntity.InteractiveSessionId before launch, so an abort at any
point still leaves a resumable id. BuildForTaskAsync now resumes this task's own last
interactive session in preference to the latest autonomous run's session, but never across a
freshly (re)created worktree.

src/ClaudeDo.Data/Repositories/TaskRepository.cs

@@ -402,6 +402,19 @@ public sealed class TaskRepository
                 .SetProperty(t => t.HandlerHeadCommit, headCommit), ct);
     }
 
+    // Persists the claude session id a fresh embedded ConPTY interactive task session will run
+    // under, written BEFORE launch so a closed/aborted session still leaves a resumable id.
+    public async Task SetInteractiveSessionIdAsync(
+        string taskId,
+        string? sessionId,
+        CancellationToken ct = default)
+    {
+        await _context.Tasks
+            .Where(t => t.Id == taskId)
+            .ExecuteUpdateAsync(s => s
+                .SetProperty(t => t.InteractiveSessionId, sessionId), ct);
+    }
+
     public async Task<TaskEntity?> FindByPlanningTokenAsync(
         string token,
         CancellationToken ct = default)