feat: Random.org dice and daily word matrix, interpreter voices, curated lexicon

Wire cleromancy rolls and the once-per-UTC-day 000-999 word shuffle to RANDOM.ORG JSON-RPC, with a local CSPRNG fallback. Add settings for interpreter personas and a cleaner default oracle prompt. Replace proper names and bureaucratic filler in the 1000-word lexicon with sacred symbols.

test/words_repository_test.dart

@@ -12,7 +12,7 @@ void main() {
     setUp(() async {
       SharedPreferences.setMockInitialValues({});
       repo = WordsRepository();
-      await repo.init();
+      await repo.init(remoteDailyShuffle: false);
     });
 
     test('Dataset contains exactly 1000 words with unique randomized session numbers 000 to 999', () {
@@ -33,14 +33,25 @@ void main() {
       expect(seenSessionNumbers.length, equals(1000));
     });
 
-    test('Reshuffling changes the order / mapping of words to session numbers', () {
-      repo.reshuffleSessionNumbers();
+    test('Reshuffling changes the order / mapping of words to session numbers', () async {
+      await repo.reshuffleSessionNumbers();
       expect(repo.totalWords, equals(1000));
       for (int i = 0; i < 1000; i++) {
         expect(repo.getWordBySessionNumber(i)?.sessionNumber, equals(i));
       }
     });
 
+    test('Same UTC day reuses the persisted word matrix', () async {
+      final first = [
+        for (int i = 0; i < 8; i++) repo.getWordBySessionNumber(i)!.word,
+      ];
+      await repo.init(remoteDailyShuffle: false);
+      expect([
+        for (int i = 0; i < 8; i++) repo.getWordBySessionNumber(i)!.word,
+      ], first);
+      expect(repo.dailyMappingDate, WordsRepository.utcDateStamp());
+    });
+
     test('Search by number string returns correct session word', () {
       final results0 = repo.search('0');
       expect(results0.isNotEmpty, isTrue);