Remove autogenerated metadata_aigenerated.yaml files from Published models

[Psuedonerd]

Motivation

• Remove stale or redundant AI-generated metadata files that duplicate or conflict with canonical model metadata.
• Reduce repository clutter in the Published model tree and avoid exposing potentially out-of-date autogenerated metadata.

Description

• Delete numerous metadata_aigenerated.yaml files under Published/* (e.g., Published/An2009/metadata_aigenerated.yaml, Published/Barua2007/metadata_aigenerated.yaml, Published/Blinov2006/metadata_aigenerated.yaml, Published/Zhang2023/metadata_aigenerated.yaml, and many other published-model subdirectories).
• The change is strictly file removals of autogenerated metadata files and does not modify model source files, code, or canonical metadata.
• Files removed follow the pattern Published/<model>/metadata_aigenerated.yaml across many model directories.

Testing

• No automated tests were executed as part of this change because the modification only removes autogenerated metadata files and does not affect executable code.

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Codex Task