Feature: Implement support for climb action bindings

src/document/migrate-scene-document.ts

@@ -1826,6 +1826,11 @@ function readPlayerStartInputBindings(value: unknown, label: string) {
         `${label}.keyboard.crouch`,
         DEFAULT_PLAYER_START_KEYBOARD_BINDINGS.crouch
       ),
+      climb: readPlayerStartKeyboardBindingCode(
+        keyboard?.climb,
+        `${label}.keyboard.climb`,
+        DEFAULT_PLAYER_START_KEYBOARD_BINDINGS.climb
+      ),
       interact: readPlayerStartKeyboardBindingCode(
         keyboard?.interact,
         `${label}.keyboard.interact`,
@@ -1878,6 +1883,11 @@ function readPlayerStartInputBindings(value: unknown, label: string) {
         `${label}.gamepad.crouch`,
         DEFAULT_PLAYER_START_GAMEPAD_BINDINGS.crouch
       ),
+      climb: readPlayerStartGamepadActionBinding(
+        gamepad?.climb,
+        `${label}.gamepad.climb`,
+        DEFAULT_PLAYER_START_GAMEPAD_BINDINGS.climb
+      ),
       interact: readPlayerStartGamepadActionBinding(
         gamepad?.interact,
         `${label}.gamepad.interact`,

src/document/scene-document-validation.ts

@@ -3296,6 +3296,17 @@ function validatePlayerStartEntity(
     );
   }
 
+  if (!isPlayerStartKeyboardBindingCode(entity.inputBindings?.keyboard.climb)) {
+    diagnostics.push(
+      createDiagnostic(
+        "error",
+        "invalid-player-start-climb-keyboard-binding",
+        "Player Start climb keyboard binding must be a supported key code.",
+        `${path}.inputBindings.keyboard.climb`
+      )
+    );
+  }
+
   if (
     !isPlayerStartKeyboardBindingCode(entity.inputBindings?.keyboard.interact)
   ) {
@@ -3433,6 +3444,19 @@ function validatePlayerStartEntity(
     );
   }
 
+  if (
+    !isPlayerStartGamepadActionBinding(entity.inputBindings?.gamepad.climb)
+  ) {
+    diagnostics.push(
+      createDiagnostic(
+        "error",
+        "invalid-player-start-climb-gamepad-binding",
+        "Player Start climb gamepad binding must be a supported standard-gamepad action input.",
+        `${path}.inputBindings.gamepad.climb`
+      )
+    );
+  }
+
   if (
     !isPlayerStartGamepadActionBinding(entity.inputBindings?.gamepad.interact)
   ) {