store artifacts

[xzrderek]

Note

Improves propagation and preservation of rollout metadata from tracing logs.

• In remote_rollout_processor.py, warn if multiple status logs are found and use the first; extract filtered extras from the status log and merge into row.execution_metadata.extra.
• In tracing_utils.update_row_with_remote_trace, deep-copy remote execution_metadata and merge previously preserved local extra into it (local values take precedence).

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