feat(KB-130): allow dependent tasks to start from in-review dep branches

- Relax scheduler dep gate to treat in-review tasks as satisfied
- Add resolveBaseBranch() to detect in-review deps with unmerged worktrees
- Executor creates worktrees from dep branch instead of HEAD when baseBranch is set
- Extend file-overlap tracking to include in-review tasks with worktrees
- Add baseBranch field to Task type and store update logic
- Add scheduler and executor tests for in-review dependency handling

packages/core/src/store.ts

@@ -287,7 +287,7 @@ export class TaskStore extends EventEmitter<TaskStoreEvents> {
 
   async updateTask(
     id: string,
-    updates: { title?: string; description?: string; prompt?: string; worktree?: string; status?: string | null; dependencies?: string[]; blockedBy?: string | null; paused?: boolean },
+    updates: { title?: string; description?: string; prompt?: string; worktree?: string; status?: string | null; dependencies?: string[]; blockedBy?: string | null; paused?: boolean; baseBranch?: string },
   ): Promise<Task> {
     return this.withTaskLock(id, async () => {
       const dir = this.taskDir(id);
@@ -308,6 +308,7 @@ export class TaskStore extends EventEmitter<TaskStoreEvents> {
         task.blockedBy = updates.blockedBy;
       }
       if (updates.paused !== undefined) task.paused = updates.paused || undefined;
+      if (updates.baseBranch !== undefined) task.baseBranch = updates.baseBranch;
       task.updatedAt = new Date().toISOString();
 
       await this.atomicWriteTaskJson(dir, task);

packages/core/src/types.ts

@@ -66,6 +66,12 @@ export interface Task {
   blockedBy?: string;
   /** When true, all automated agent and scheduler interaction is suspended. */
   paused?: boolean;
+  /** Git branch name (or task ID) to use as the starting point when
+   *  creating this task's worktree. Set by the scheduler when a task's
+   *  explicit dependency or `blockedBy` task is in-review with an
+   *  unmerged branch. The executor reads this to branch from the
+   *  dependency's branch instead of HEAD. Cleared after worktree creation. */
+  baseBranch?: string;
   attachments?: TaskAttachment[];
   log: TaskLogEntry[];
   size?: "S" | "M" | "L";