Follow the LICENSE.txt -> LICENSE rename in README and package build

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

README.md

@@ -183,7 +183,7 @@ regenerated with `python tools/gen_icons.py`.
 
 ## License
 
-GPL-3.0-or-later — see [LICENSE.txt](LICENSE.txt).
+GPL-3.0-or-later — see [LICENSE](LICENSE).
 
 ## Troubleshooting
 

tools/build_package.py

@@ -29,7 +29,7 @@ PLUGIN_FILES = [
     "plugin.json",
     "fill_res_action.py",
     "requirements.txt",
-    "LICENSE.txt",
+    "LICENSE",
 ]
 PLUGIN_GLOBS = [
     ("fill_resistance", "*.py"),