Add test marker file

[pullfrog]

Summary

• add a test file containing the current PULLFROG_FILE_TEST marker output

Testing

• not run

  ^{｜ Using Codex CLI ｜ Triggered by Pullfrog ｜ pullfrog.com ｜ 𝕏}

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Note

Low Risk
Adds a non-functional marker file only; no production code or logic changes.

Overview
Adds a new test-file.txt containing a single UUID-like marker value (no trailing newline).

^{Written by Cursor Bugbot for commit a31cd37. This will update automatically on new commits. Configure here.}