Implement Retire HoF (Gauntlet) rule enforcement for genlockes

When retireHoF is enabled, surviving HoF Pokemon and their evolutionary
families are retired at leg advancement and treated as duplicates in all
subsequent legs — both in the encounter modal and bulk randomize.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/components/EncounterModal.tsx

@@ -17,6 +17,7 @@ interface EncounterModalProps {
   gameId: number
   existing?: EncounterDetail
   dupedPokemonIds?: Set<number>
+  retiredPokemonIds?: Set<number>
   onSubmit: (data: {
     routeId: number
     pokemonId: number
@@ -93,6 +94,7 @@ export function EncounterModal({
   gameId,
   existing,
   dupedPokemonIds,
+  retiredPokemonIds,
   onSubmit,
   onUpdate,
   onClose,
@@ -285,7 +287,7 @@ export function EncounterModal({
                                 </span>
                                 {isDuped && (
                                   <span className="text-[10px] text-gray-400 italic">
-                                    already caught
+                                    {retiredPokemonIds?.has(rp.pokemonId) ? 'retired (HoF)' : 'already caught'}
                                   </span>
                                 )}
                                 {!isDuped && SPECIAL_METHODS.includes(rp.encounterMethod) && (