🧹 Remove dead vestigial symlink cleanup code in setup

[savvides]

🎯 What: Removed the vestigial bare-symlink cleanup loop and associated comments from the setup script.
💡 Why: The comment in the code explicitly stated that this was dead code left over from pre-marketplace install methods. Removing dead code simplifies the script, improving maintainability and reducing noise.
✅ Verification: Ran bash -n setup to ensure syntax is valid, and ran ./test/smoke-test.sh, ./test/integration-test.sh, ./test/test-manifest-merge.sh, and ./test/test-version-classifier.sh to confirm that all test cases pass properly. The code review also correctly assessed that no functionalities are affected by this safe removal.
✨ Result: The setup script is now cleaner and easier to read without altering any behavior.

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PR created automatically by Jules for task 10742332350787755589 started by @savvides

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[gemini-code-assist]

Code Review

This pull request removes the vestigial bare-symlink cleanup logic from the setup script, as current Claude Code versions discover plugins via the marketplace registry rather than symlinks. I have no feedback to provide as there were no review comments.