style: apply rustfmt formatting

src/lib.rs

@@ -80,7 +80,6 @@ impl ValidationConfig {
     }
 }
 
-
 /// Simple validation result for CLI
 pub struct ValidationResult {
     pub is_valid: bool,

src/model.rs

@@ -109,13 +109,8 @@ pub struct Scenario {
 // Period with forever support
 #[derive(Debug, Clone)]
 pub enum Period {
-    Instant {
-        date: String,
-    },
-    Duration {
-        start: String,
-        end: String,
-    },
+    Instant { date: String },
+    Duration { start: String, end: String },
     Forever,
 }