S00-005: Select idb and verify transactional storage failure policies

Changes: Propose ADR 0004 comparing native IndexedDB, idb and Dexie; select idb 8.0.4 with account, transaction, quota, upgrade and key ownership policy. Repair rollback and add injected quota/blocked upgrade checks, exact wrapper lock, runtime guard, license texts and reproduction notes. Preserve historical recovery artifacts.
Validation: Fresh-cache npm ci and npm run check passed on Node 24.21.0/npm 11.19.0; manifest, HTTPS/SHA512 and license checks passed. make check passed 72 tooling tests; tasks.py validate and git diff --check passed. Native browser quota, disk durability and process restart were not tested; ADR remains proposed for independent QA.

Task: S00-005
Agent: auto-storage-0ce544ac4b40
Role: storage
Action: claim
Status: review

Task title: Выбрать IndexedDB wrapper и migration policy

experiments/0004-storage-design/package.json

@@ -3,14 +3,18 @@
   "version": "0.0.0",
   "private": true,
   "type": "module",
-  "engines": { "node": "24.21.0", "npm": "11.19.0" },
+  "engines": {
+    "node": "24.21.0",
+    "npm": "11.19.0"
+  },
   "packageManager": "npm@11.19.0",
   "scripts": {
     "check:rollback": "node src/rollback.mjs",
     "check:quota": "node src/quota-blocked.mjs",
-    "check": "npm run check:rollback && npm run check:quota"
+    "check": "node src/check-runtime.mjs && npm run check:rollback && npm run check:quota"
   },
   "dependencies": {
-    "fake-indexeddb": "6.2.5"
+    "fake-indexeddb": "6.2.5",
+    "idb": "8.0.4"
   }
-}
+}