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-lock.json

@@ -8,7 +8,8 @@
       "name": "0004-storage-design",
       "version": "0.0.0",
       "dependencies": {
-        "fake-indexeddb": "6.2.5"
+        "fake-indexeddb": "6.2.5",
+        "idb": "8.0.4"
       },
       "engines": {
         "node": "24.21.0",
@@ -23,6 +24,12 @@
       "engines": {
         "node": ">=18"
       }
+    },
+    "node_modules/idb": {
+      "version": "8.0.4",
+      "resolved": "https://registry.npmjs.org/idb/-/idb-8.0.4.tgz",
+      "integrity": "sha512-jd0ITCrN+Zah4J7R/Z2jnR3W7A4BXDAjmo62MwWuSjxCiueUAf7X5rbodEdidWzeknwXHmLpdZkoiiCppNi30Q==",
+      "license": "ISC"
     }
   }
 }