M3: модуль сохранения

По ARCHITECTURE.md: реестр независимых секций, JSON с ключом на секцию.
Ключи — явные строковые константы, а не имена классов: релизная сборка
минифицирует имена и молча потеряла бы все сохранения.

- ISaveSection, SaveManager, IStorage + MemoryStorage
- CocosStorage: единственный файл модуля, знающий про движок;
  при отказе хранилища уходит в память, а не роняет игру
- StatsSection: сыграно/побед/поражений/ничьих, текущая и лучшая серия
- терпимая загрузка: битый JSON, чужая версия, сломанная секция
  или отвалившееся хранилище не ломают остальное
- проверка чистоты расширена на modules/ со списком адаптеров

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

scripts/check-core-purity.mjs

@@ -1,28 +1,59 @@
-// Guards the one architectural rule that the type system cannot express:
-// assets/scripts/core must never import the Cocos engine. See docs/TECHNICAL.md.
+// Guards the one architectural rule the type system cannot express: the game
+// logic must not depend on the engine. See docs/TECHNICAL.md.
+//
+//   core/     never imports `cc`, at all.
+//   modules/  is engine-aware, but only through the adapters listed below —
+//             everything else in it stays testable headlessly.
+//
+// A new file that needs `cc` under modules/ is a deliberate decision, so it has
+// to be added here on purpose rather than slipping in unnoticed.
 import { readdirSync, readFileSync, statSync } from 'node:fs';
-import { join } from 'node:path';
+import { join, relative, sep } from 'node:path';
+
+const PURE_ROOT = 'assets/scripts/core';
+const MODULES_ROOT = 'assets/scripts/modules';
+const ENGINE_ADAPTERS = new Set([
+    'save/CocosStorage.ts',
+]);
+
+const ENGINE_IMPORT = /\bfrom\s+['"](cc|cc\/env)['"]/;
 
-const ROOT = 'assets/scripts/core';
-const FORBIDDEN = /from\s+['"](cc|cc\/env|db:\/\/)/;
 const offenders = [];
 
-function walk(dir) {
+function walk(dir, onFile) {
     for (const entry of readdirSync(dir)) {
-        const p = join(dir, entry);
-        if (statSync(p).isDirectory()) walk(p);
-        else if (p.endsWith('.ts')) {
-            const src = readFileSync(p, 'utf8');
-            src.split('\n').forEach((line, i) => {
-                if (FORBIDDEN.test(line)) offenders.push(`${p}:${i + 1}  ${line.trim()}`);
-            });
-        }
+        const path = join(dir, entry);
+        if (statSync(path).isDirectory()) walk(path, onFile);
+        else if (path.endsWith('.ts')) onFile(path);
     }
 }
 
-walk(ROOT);
-if (offenders.length) {
-    console.error('core/ must not import the engine:\n' + offenders.join('\n'));
+function engineImports(path) {
+    return readFileSync(path, 'utf8')
+        .split('\n')
+        .map((line, i) => ({ line: line.trim(), number: i + 1 }))
+        .filter((entry) => ENGINE_IMPORT.test(entry.line));
+}
+
+walk(PURE_ROOT, (path) => {
+    for (const hit of engineImports(path)) {
+        offenders.push(`${path}:${hit.number}  ${hit.line}   (core/ must never import the engine)`);
+    }
+});
+
+walk(MODULES_ROOT, (path) => {
+    const key = relative(MODULES_ROOT, path).split(sep).join('/');
+    if (ENGINE_ADAPTERS.has(key)) return;
+    for (const hit of engineImports(path)) {
+        offenders.push(
+            `${path}:${hit.number}  ${hit.line}   (add '${key}' to ENGINE_ADAPTERS if this is intended)`,
+        );
+    }
+});
+
+if (offenders.length > 0) {
+    console.error(`Engine dependency in code that must stay pure:\n${offenders.join('\n')}`);
     process.exit(1);
 }
+
 console.log('core purity OK');