fix: path discovery of cosmoteer for manjaro linux

README.md

@@ -98,6 +98,7 @@ No stat or number is changed. Only *when* radiators run.
 mod.rules                              manifest + patch actions
 components/radiator_auto.rules         measures network headroom, gates the radiator
 tests/                                 offline validation suite
+tests/steam_paths.py                   finds the game via Steam's libraryfolders.vdf
 tools/dotnet_enum.py                   reads component schemas out of Cosmoteer.dll
 tools/ildump.py                        disassembles component methods to readable CIL
 install.sh                             validate + copy into the Mods folder
@@ -110,12 +111,18 @@ install.sh                             validate + copy into the Mods folder
 ```
 
 Then enable **Auto Radiator** in the game's Mods menu. `./install.sh --uninstall`
-removes it. If the script cannot find your Mods folder, set `COSMOTEER_MODS_DIR`.
+removes it.
+
+The script finds the game by reading Steam's `libraryfolders.vdf`, so a library
+on a second disk and a Proton prefix are both handled. If it still comes up
+empty it prints the libraries it searched; set `COSMOTEER_MODS_DIR` to override.
 
 ## Tests
 
 ```sh
-python3 tests/test_mod.py
+python3 tests/test_mod.py        # the mod, against installed game data
+python3 tests/test_steam_paths.py  # game discovery
+./tests/test_install.sh            # Mods folder discovery
 ```
 
 Cosmoteer applies mod actions to vanilla data at load time. Some mistakes crash