fix(clippy): address Rust 1.97 lints

adapters/fparkan-render-vulkan/src/planning_backend.rs

@@ -10,9 +10,10 @@ use crate::{
 };
 
 /// Vulkan backend migration readiness.
-#[derive(Clone, Copy, Debug, Eq, PartialEq)]
+#[derive(Clone, Copy, Debug, Default, Eq, PartialEq)]
 pub enum VulkanPlanningBackendState {
     /// Planning facade is configured and able to accept command lists.
+    #[default]
     Configured,
     /// Adapter is tracking a recoverable runtime surface/depth pipeline fault.
     Degraded,
@@ -20,12 +21,6 @@ pub enum VulkanPlanningBackendState {
     Error,
 }
 
-impl Default for VulkanPlanningBackendState {
-    fn default() -> Self {
-        Self::Configured
-    }
-}
-
 /// Diagnostics for planning-facade request tracking.
 #[derive(Clone, Debug, PartialEq)]
 pub struct VulkanPlanningRequestReport {