Mario Zechner b171e10da6 Fix test runner to properly detect and build fat jar
- Look specifically for spine-headless-test-*.jar instead of any jar
- Ensures fat jar with all dependencies gets built and used
- Revert workflow to let test runner handle jar building

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>
2025-07-21 02:50:38 +02:00
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