Preserve object input semantics for abilities with input schema

Co-authored-by: swissspidy <841956+swissspidy@users.noreply.github.com>

Author: Copilot

src/Ability_Command.php

@@ -369,6 +369,9 @@ public function run( $args, $assoc_args ): void {
 
 		// Build input data (with stdin support).
 		$input = $this->build_input_with_stdin( $assoc_args );
+		if ( null === $input && ! empty( $ability->get_input_schema() ) ) {
+			$input = [];
+		}
 
 		// Execute the ability.
 		$result = $ability->execute( $input );