Style: add missing @Override (#18)

core/src/main/java/org/projectnessie/cel/ProgGen.java

@@ -30,6 +30,7 @@ final class ProgGen implements Program, Coster {
   }
 
   /** Eval implements the Program interface method. */
+  @Override
   public EvalResult eval(Object input) {
     // The factory based Eval() differs from the standard evaluation model in that it generates a
     // new EvalState instance for each call to ensure that unique evaluations yield unique stateful

core/src/main/java/org/projectnessie/cel/common/debug/Debug.java

@@ -158,6 +158,7 @@ public interface Adorner {
   }
 
   static class EmptyDebugAdorner implements Adorner {
+    @Override
     public String getMetadata(Object e) {
       return "";
     }

core/src/main/java/org/projectnessie/cel/common/types/TypeT.java

@@ -98,6 +98,7 @@ public Val convertToType(Type typeVal) {
   }
 
   /** Equal implements ref.Val.Equal. */
+  @Override
   public Val equal(Val other) {
     if (TypeType != other.type()) {
       return noSuchOverload(this, "equal", other);

core/src/main/java/org/projectnessie/cel/interpreter/Interpretable.java

@@ -93,15 +93,18 @@ interface InterpretableAttribute extends Interpretable, Qualifier, Attribute {
      * not copyable by default, so this is a capable that would need to be added to the
      * AttributeFactory or specifically to the underlying Attribute implementation.
      */
+    @Override
     Attribute addQualifier(Qualifier qualifier);
 
     /**
      * Qualify replicates the Attribute.Qualify method to permit extension and interception of
      * object qualification.
      */
+    @Override
     Object qualify(Activation vars, Object obj);
 
     /** Resolve returns the value of the Attribute given the current Activation. */
+    @Override
     Object resolve(Activation act);
   }
 
@@ -445,6 +448,7 @@ public Val eval(org.projectnessie.cel.interpreter.Activation ctx) {
     }
 
     /** Cost implements the Coster interface method. */
+    @Override
     public Cost cost() {
       return calExhaustiveBinaryOpsCost(lhs, rhs);
     }