fix: set FORGE_WORKING_DIR to forge-gui (requires res/ folder for sim to start)

.env.example

@@ -2,11 +2,20 @@
 # Copy this file to .env and fill in your values.
 # start-lab.bat will auto-load .env if it exists.
 
-# ── API Keys ──────────────────────────────────────────────────
+# ── API Keys ──────────────────────────────────────────────────────
 ANTHROPIC_API_KEY=your-anthropic-api-key-here
 XIMILAR_API_KEY=your-ximilar-key-here
 
-# ── Deck Paths ────────────────────────────────────────────────
+# ── Forge JAR Path ────────────────────────────────────────────────
+# Point this to your Forge GUI desktop fat JAR.
+FORGE_JAR_PATH=D:/ForgeCommander/forge-repo/forge-gui-desktop/target/forge-gui-desktop-2.0.12-SNAPSHOT-jar-with-dependencies.jar
+
+# IMPORTANT: Forge MUST be launched from the forge-gui directory (not forge-gui-desktop/target).
+# The JAR looks for res/ relative to its working directory. Without this, you get
+# ExceptionInInitializerError on startup.
+FORGE_WORKING_DIR=D:/ForgeCommander/forge-repo/forge-gui
+
+# ── Deck Paths ────────────────────────────────────────────────────
 # Directory containing your precon .dck files.
 # Forge reads deck files directly from this folder.
 PRECON_DECKS_DIR=D:\ForgeCommander\commander-ai-lab\precon-decks