Add wpak cfg reader and PowerActions.cfg loader

New engine.parsers.wpak importer (replaces engine.wpak, which stays unused).
WpakFileReader tokenizes cfg lines (quotes, '#'/'*' comments, trailing '#')
and builds XxxBEGIN/XxxEND blocks; every error names file:line.

PowerActionParser loads PowerActions.cfg into PowerActionTemplate._powerActions,
keyed by action id, at world boot. Header layouts per action type come from
the client's ArcPowerAction*_ParseHeader functions: the trailing 0/1 on
ApplyEffect and friends is the aggressive flag, not a level. effect_ids holds
the action -> effect map needed by Task 2.10b. Three ids (PRE-235..237)
repeat identically; the later entry wins, as in the client. No consumers change.

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

src/engine/parsers/wpak/WpakFormatException.java

@@ -0,0 +1,18 @@
+//  • ▌ ▄ ·.  ▄▄▄·  ▄▄ • ▪   ▄▄· ▄▄▄▄·  ▄▄▄·  ▐▄▄▄  ▄▄▄ .
+//  ·██ ▐███▪▐█ ▀█ ▐█ ▀ ▪██ ▐█ ▌▪▐█ ▀█▪▐█ ▀█ •█▌ ▐█▐▌·
+//  ▐█ ▌▐▌▐█·▄█▀▀█ ▄█ ▀█▄▐█·██ ▄▄▐█▀▀█▄▄█▀▀█ ▐█▐ ▐▌▐▀▀▀
+//  ██ ██▌▐█▌▐█ ▪▐▌▐█▄▪▐█▐█▌▐███▌██▄▪▐█▐█ ▪▐▌██▐ █▌▐█▄▄▌
+//  ▀▀  █▪▀▀▀ ▀  ▀ ·▀▀▀▀ ▀▀▀·▀▀▀ ·▀▀▀▀  ▀  ▀ ▀▀  █▪ ▀▀▀
+//      Magicbane Emulator Project © 2013 - 2026
+//                https://www.magicbane.com
+
+package engine.parsers.wpak;
+
+// A malformed wpak cfg entry. The message starts with file:line.
+
+public class WpakFormatException extends RuntimeException {
+
+    public WpakFormatException(String message) {
+        super(message);
+    }
+}