Read wpak cfgs from one folder per archive

Files now load from mb.data/wpak/<archive>/<file>, matching MBDATA's
data/wpak layout and the client's Config/Config.wpak naming, so more
archives can sit beside Config/ later. All nine current files are in
wpak/Config/.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/engine/parsers/wpak/CompoundCurveParser.java

@@ -18,7 +18,7 @@ import java.util.HashMap;
 
 public class CompoundCurveParser {
 
-    private static final String fileName = "CompoundCurves.cfg";
+    private static final String fileName = "Config/CompoundCurves.cfg";
 
     // Segments run back to back on one line, so the param count per simple curve
     // is what tells where the next segment starts.