chore(system): move memory_bank.central.json to .aicentral/

Memory moved the file from src/aipass/central/ (wrong location)
to .aicentral/ (correct location). Repo-level commit required
since .aicentral/ is outside branch directories.

Co-Authored-By: @devpulse <devpulse@aipass>
Co-Authored-By: @memory <memory@aipass>
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.aicentral/memory_bank.central.json

@@ -0,0 +1,9 @@
+{
+  "service": "memory_bank",
+  "last_updated": "2026-03-17T18:19:25.268718",
+  "stats": {
+    "total_vectors": 0,
+    "total_archives": 0,
+    "last_rollover": ""
+  }
+}