test: unblock-resume tests need a claimed task (branch_name)

The lifecycle fix routes a never-claimed (no-branch) blocked task to pending on
unblock; these two tests asserted in_progress on a no-branch task. Give them a
branch so they exercise the claimed-task resume path they intend (no-branch ->
pending is covered by new unit tests).

tests/integration/test_task_service_basics.py

@@ -875,6 +875,9 @@ async def test_unblock_restores_to_in_progress(
     task = await svc.create(_req(task_setup))
     task.status = TaskStatus.IN_PROGRESS
     task.assigned_to = task_setup["agent_id"]
+    # A claimed, actively-worked task has a branch; with one, unblock resumes
+    # in_progress (a never-claimed/no-branch task returns to pending instead).
+    task.branch_name = "feature/backend/abc12345"
     await db_session.flush()
     await svc.soft_block(
         task.id,

tests/integration/test_task_service_transitions.py

@@ -1462,6 +1462,9 @@ async def test_unblock_with_restore_with_invalid_pre_block_state(
     task = await svc.create(_req(task_setup))
     task.status = TaskStatus.BLOCKED
     task.pre_block_state = "garbage"
+    # Has a branch (was claimed before blocking) so legacy unblock resumes
+    # in_progress rather than returning a never-claimed task to pending.
+    task.branch_name = "feature/backend/abc12345"
     await db_session.flush()
     out = await svc.unblock_with_restore(
         pm_agent_id=task_setup["agent_id"], task_id=task.id, restore=True