feat: add State Hub bulk status skill

mcp_server/TOOLS.md

@@ -31,6 +31,7 @@ endpoint they wrap:
 | `create_workstream(...)` | `POST /workstreams/` |
 | `create_task(...)` | `POST /tasks/` |
 | `update_task_status(...)` | `PATCH /tasks/{task_id}` |
+| `bulk_update_task_statuses(...)` | `POST /tasks/bulk-status-sync` |
 | `record_decision(...)` | `POST /decisions/` |
 | `add_progress_event(...)` | `POST /progress/` |
 
@@ -93,6 +94,7 @@ entity while recording the missing progress event.
 | `create_workstream(topic_id, title, ...)` | `slug?`; `owner?`; `description?`; `due_date?` | Creates workstream under a topic. Use `get_state_summary()` to find topic IDs. |
 | `create_task(workstream_id, title, ...)` | `priority`: low/medium/high/critical; `assignee?`; `due_date?` | Creates task under a workstream. |
 | `update_task_status(task_id, status, ...)` | `status`: wait/todo/progress/done/cancel; `blocking_reason?` describes wait conditions | Legacy aliases `blocked`, `in_progress`, `cancelled`, and `canceled` are accepted during migration. |
+| `bulk_update_task_statuses(updates, author?, session_id?)` | `updates`: list of `{task_id, status, blocking_reason?}` | Updates many task statuses in one REST call and emits one `task_status_changed` progress event per task. Prefer this at session checkpoints instead of many single-task calls. |
 | `update_workstream_status(workstream_id, status)` | `status`: proposed/ready/active/blocked/backlog/finished/archived | Thin shortcut — use `update_workstream` for full field control. |
 | `update_workstream(workstream_id, ...)` | `title?`; `description?`; `owner?`; `due_date?`; `repo_goal_id?`; `status?` | Patch any subset of workstream fields. Pass empty string for `repo_goal_id` to clear the link. |