chore(release): bump claude-mem to 13.0.0

Major version bump following PR #2351 merge — server-beta runtime,
Postgres observation storage, BullMQ queue engine, and Apache 2.0
relicense are now on main.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

openclaw/openclaw.plugin.json

@@ -3,7 +3,7 @@
   "name": "Claude-Mem (Persistent Memory)",
   "description": "OpenClaw plugin for Claude-Mem. Records observations from embedded runner sessions and streams them to messaging channels.",
   "kind": "memory",
-  "version": "12.7.5",
+  "version": "13.0.0",
   "license": "Apache-2.0",
   "author": "thedotmack",
   "homepage": "https://claude-mem.com",