remove the :Zone.Identifier file from the repository

The repository should remove the :Zone.Identifier file from the repository as it's a Windows-specific metadata file that shouldn't be committed. Its causing errors when cloning to a windows desktop OS.

Cloning into 'sample-agentic-ai-factory'...
remote: Enumerating objects: 442, done.
remote: Counting objects: 100% (442/442), done.
remote: Compressing objects: 100% (357/357), done.
remote: Total 442 (delta 68), reused 429 (delta 62), pack-reused 0 (from 0)
Receiving objects: 100% (442/442), 13.78 MiB | 13.55 MiB/s, done.
Resolving deltas: 100% (68/68), done.
error: invalid path 'service/sample-data/knowledge-data/AU-guidance-for-ai-adoption-foundations.pdf:Zone.Identifier'
fatal: unable to checkout working tree
warning: Clone succeeded, but checkout failed.
You can inspect what was checked out with 'git status'
and retry with 'git restore --source=HEAD :/'

Start by inspecting the tracked path service/sample-data/knowledge-data/AU-guidance-for-ai-adoption-foundations.pdf:Zone.Identifier and the repository status. Verify that the Windows-specific metadata file is no longer tracked, then test a fresh clone and checkout; done means cloning completes without the invalid-path error.

Written by the indexing model from the issue text.