Remove the Operator HUD layout

Display > HUD > Layout and the set_hud voice action now offer Tactical,
Minimal and Cyber. The Operator option, its CSS and its QA coverage are
removed, and the unused "Operator" translations are pruned.

Share-link codes are append-only, so operator keeps its hudVariant code.
A link, scene or saved state that names it restores the default Tactical
layout. The voice schema pins keep their legacy digests by restoring the
retired value before comparing; the full-payload digest is re-derived.

src/firstRunExperience.test.mjs

@@ -1022,14 +1022,10 @@ test('the voice TOOL SCHEMA matches the pinned contract — the mission mapping
   );
   const hudLayout = legacyTools.find((tool) => tool.name === 'set_hud')
     .parameters.properties.layout;
-  assert.deepEqual(hudLayout.enum, [
-    'tactical',
-    'operator',
-    'minimal',
-    'cyber',
-  ]);
-  // Cyber deliberately adds one layout; first-run missions still change no tools.
-  hudLayout.enum = hudLayout.enum.filter((layout) => layout !== 'cyber');
+  assert.deepEqual(hudLayout.enum, ['tactical', 'minimal', 'cyber']);
+  // Cyber deliberately adds one layout and Operator was retired; first-run
+  // missions still change no tools.
+  hudLayout.enum = ['tactical', 'operator', 'minimal'];
   const cameraMotion = legacyTools.find((tool) => tool.name === 'move_camera')
     .parameters.properties.motion;
   assert.deepEqual(cameraMotion.enum, [