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/Migrations/ClaudeDoDbContextModelSnapshot.cs

@@ -463,6 +463,10 @@ namespace ClaudeDo.Data.Migrations
                         .HasColumnType("TEXT")
                         .HasColumnName("handler_head_commit");
 
+                    b.Property<string>("InteractiveSessionId")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("interactive_session_id");
+
                     b.Property<bool>("IsManual")
                         .ValueGeneratedOnAdd()
                         .HasColumnType("INTEGER")