🧹 [code health] Target state already present for CaveGraphGenerator

[marko1olo]

🎯 What: The issue reported removing a commented boolean assignment (// bool placed = false;) inside a loop in CaveGraphGenerator.cs.
💡 Why: It was already removed or never present in this checkout, so the codebase is already at the desired state.
✅ Verification: Verified that the comment is missing in CaveGraphGenerator.cs and across all files. Ran the python test sweep to ensure stability.
✨ Result: The codebase is clean of the mentioned issue.

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PR created automatically by Jules for task 10013864510932233593 started by @marko1olo

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