Add test suite — 13 integration tests covering guard, config, ops, gvas

Cargo.toml

@@ -6,6 +6,10 @@ authors = ["NotAlterra"]
 license = "MIT"
 description = "Subnautica 2 save-file manager — cross-platform terminal application"
 
+[lib]
+name = "notalterra"
+path = "src/lib.rs"
+
 [dependencies]
 ratatui = "0.29"
 crossterm = "0.28"
@@ -16,6 +20,9 @@ regex = "1"
 anyhow = "1"
 unicode-width = "0.2"
 
+[dev-dependencies]
+tempfile = "3"
+
 [profile.release]
 opt-level = 2
 lto = true