clan-cli: Add verb 'cancel' to openapi

pkgs/clan-cli/clan_lib/api/tasks.py

@@ -33,7 +33,7 @@ def cancel_task(task_id: str) -> None:
 
 
 @API.register
-def long_blocking_task(somearg: str) -> str:
+def run_blocking_task(somearg: str) -> str:
     """A long blocking task that simulates a long-running operation."""
     time.sleep(1)
     ctx = get_async_ctx()

pkgs/clan-cli/openapi.py

@@ -26,6 +26,7 @@ COMMON_VERBS = {
     "open",  # initiate session, shell, file, etc.
     "check",  # validate, probe, or assert
     "run",  # start imperative task or action; machine-deploy etc.
+    "cancel"
 }