feat(HAI-057): add task dependency editing to dashboard UI

- Add dependencies field support to store updateTask method
- Wire dependencies through PATCH route and client API
- Add dependency editing UI (add/remove) to TaskDetailModal
- Pass tasks prop from App to TaskDetailModal for dependency picker
- Add tests for dependency CRUD in modal and API layer

packages/core/src/store.test.ts

@@ -348,4 +348,41 @@ describe("TaskStore", () => {
       expect(result.log).toHaveLength(initialLogCount + 10);
     });
   });
+
+  describe("updateTask — dependencies", () => {
+    it("adds dependencies to a task with none", async () => {
+      const task = await createTestTask();
+      expect(task.dependencies).toEqual([]);
+
+      const updated = await store.updateTask(task.id, { dependencies: ["HAI-001", "HAI-002"] });
+      expect(updated.dependencies).toEqual(["HAI-001", "HAI-002"]);
+
+      // Verify persistence
+      const fetched = await store.getTask(task.id);
+      expect(fetched.dependencies).toEqual(["HAI-001", "HAI-002"]);
+    });
+
+    it("replaces existing dependencies", async () => {
+      const task = await store.createTask({ description: "Dep task", dependencies: ["HAI-001"] });
+      expect(task.dependencies).toEqual(["HAI-001"]);
+
+      const updated = await store.updateTask(task.id, { dependencies: ["HAI-002", "HAI-003"] });
+      expect(updated.dependencies).toEqual(["HAI-002", "HAI-003"]);
+    });
+
+    it("clears dependencies with empty array", async () => {
+      const task = await store.createTask({ description: "Dep task", dependencies: ["HAI-001"] });
+      expect(task.dependencies).toEqual(["HAI-001"]);
+
+      const updated = await store.updateTask(task.id, { dependencies: [] });
+      expect(updated.dependencies).toEqual([]);
+    });
+
+    it("leaves dependencies unchanged when not provided", async () => {
+      const task = await store.createTask({ description: "Dep task", dependencies: ["HAI-001"] });
+
+      const updated = await store.updateTask(task.id, { title: "New title" });
+      expect(updated.dependencies).toEqual(["HAI-001"]);
+    });
+  });
 });

packages/core/src/store.ts

@@ -282,7 +282,7 @@ export class TaskStore extends EventEmitter<TaskStoreEvents> {
 
   async updateTask(
     id: string,
-    updates: { title?: string; description?: string; prompt?: string; worktree?: string; status?: string | null; blockedBy?: string | null },
+    updates: { title?: string; description?: string; prompt?: string; worktree?: string; status?: string | null; dependencies?: string[] },
   ): Promise<Task> {
     return this.withTaskLock(id, async () => {
       const dir = this.taskDir(id);
@@ -291,6 +291,7 @@ export class TaskStore extends EventEmitter<TaskStoreEvents> {
       if (updates.title !== undefined) task.title = updates.title;
       if (updates.description !== undefined) task.description = updates.description;
       if (updates.worktree !== undefined) task.worktree = updates.worktree;
+      if (updates.dependencies !== undefined) task.dependencies = updates.dependencies;
       if (updates.status === null) {
         task.status = undefined;
       } else if (updates.status !== undefined) {