bug: create_artifact fails with TypeError on queued/resumed tool-call replay paths

bug: create_artifact fails with TypeError on queued/resumed tool-call replay paths

Bug description

When a create_artifact tool call is replayed from the queue (queued tool
calls and resumed tasks), the call fails and no artifact is created.

To Reproduce

1. Have the agent queue a create_artifact tool call (or resume a task with a pending create_artifact call).
2. When the queued call is replayed, the tool errors instead of creating the artifact.

Actual behavior

The replay paths invoke create_artifact(**args, workspace=workspace), but
create_artifact does not declare a workspace parameter — it receives the
workspace via __context__, like every other tool. So every replayed
create_artifact call raises:

TypeError: create_artifact() got an unexpected keyword argument 'workspace'

Expected behavior

Queued/replayed create_artifact calls should succeed. The call should inject
__context__ (including call_id) the same way execute_tool does for all
other tools on the same paths, e.g.:

result = await create_artifact(
    **args, __context__={**tool_ctx, "call_id": item["call_id"]}
)

Affected sites are in run_chat_task in cptr/utils/chat_task.py.

Environment

• Latest main

Start in cptr/utils/chat_task.py at run_chat_task and inspect the queued and resumed tool-call replay paths alongside execute_tool. Verify that replayed create_artifact calls receive the same context information as other tools, then confirm queued and resumed calls complete without the TypeError and create the artifact.