perf: switch wildcard dedup to O(1) set-based approach

[Copilot]

The wildcard expansion path in JFlat.java deduplicated child paths via a nested linear scan over newEntries, making it O(K²) per wildcard segment.

Changes

• Replaced the inner for-loop dedup with a HashSet<String> seenLowercasePaths declared alongside newEntries
• Dedup is now O(1) per candidate: seenLowercasePaths.add(childPath.toLowerCase()) returns false on collision, gating the newEntries.add() call
• Added java.util.HashSet and java.util.Set imports

// Before — O(K²): scans newEntries linearly for every candidate
boolean alreadyAdded = false;
for (String added : newEntries) {
    if (added.equalsIgnoreCase(childPath)) { alreadyAdded = true; break; }
}
if (!alreadyAdded) newEntries.add(childPath);

// After — O(1): HashSet lookup on lowercase key
if (seenLowercasePaths.add(childPath.toLowerCase())) {
    newEntries.add(childPath);
}

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[Copilot]

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Warning

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I tried to connect to the following addresses, but was blocked by firewall rules:

• checkstyle.org
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