Add reversible administrator room archiving

Organize closed rooms with archive filters, live-authorized atomic receipts and exact saved retries. Preserve saved games, timestamps, credentials, discussion and AI deadlines. Unarchive leaves play closed; reopen requires unarchive, and removal/restoration preserves both flags.

Verified types, lint, 5379 offline tests, 52 HTTP tests and build. Twenty dedicated administrator HTTP groups and independent privacy/persistence review passed. Desktop/mobile browser QA confirmed a single archive after a lost response and refresh, readable recovery text, mobile unarchive and separate reopening, and saved-seat restoration. All 2,049 baseline rooms, 4,348 seats and related records preserved. Authenticated production admin acceptance awaits authorized QA access; full admin and rules gates remain open.

drizzle/meta/_journal.json

@@ -99,6 +99,13 @@
       "when": 1790042692212,
       "tag": "0013_admin_room_closure",
       "breakpoints": true
+    },
+    {
+      "idx": 14,
+      "version": "6",
+      "when": 1790044461950,
+      "tag": "0014_admin_room_archive",
+      "breakpoints": true
     }
   ]
 }