chore: bump version to 12.3.6

Removes the 300 req/min rate limiter from the worker's HTTP middleware.
The worker is localhost-only (enforced via CORS), so rate limiting was
pointless security theater — but it broke the viewer, which polls logs
and stats frequently enough to trip the limit within seconds.

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

plugin/.claude-plugin/plugin.json

@@ -1,6 +1,6 @@
 {
   "name": "claude-mem",
-  "version": "12.3.5",
+  "version": "12.3.6",
   "description": "Persistent memory system for Claude Code - seamlessly preserve context across sessions",
   "author": {
     "name": "Alex Newman"