chore: bump version to 10.0.4

Reverts v10.0.3 chroma-mcp spawn storm fix (broken release).
Restores codebase to v10.0.2 state.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

plugin/.claude-plugin/plugin.json

@@ -1,6 +1,6 @@
 {
   "name": "claude-mem",
-  "version": "10.0.3",
+  "version": "10.0.4",
   "description": "Persistent memory system for Claude Code - seamlessly preserve context across sessions",
   "author": {
     "name": "Alex Newman"