fix: redirect MCP server logs to stderr to preserve JSON-RPC protocol

MCP uses stdio transport where stdout is reserved for JSON-RPC messages.
Console.log was writing startup logs to stdout, causing Claude Desktop
to parse "[2025-12-19..." as a JSON array and fail.

Fixes #396

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.claude-plugin/marketplace.json

@@ -10,7 +10,7 @@
   "plugins": [
     {
       "name": "claude-mem",
-      "version": "7.4.0",
+      "version": "7.4.1",
       "source": "./plugin",
       "description": "Persistent memory system for Claude Code - context compression across sessions"
     }

package.json

@@ -1,6 +1,6 @@
 {
   "name": "claude-mem",
-  "version": "7.4.0",
+  "version": "7.4.1",
   "description": "Memory compression system for Claude Code - persist context across sessions",
   "keywords": [
     "claude",

plugin/.claude-plugin/plugin.json

@@ -1,6 +1,6 @@
 {
   "name": "claude-mem",
-  "version": "7.4.0",
+  "version": "7.4.1",
   "description": "Persistent memory system for Claude Code - seamlessly preserve context across sessions",
   "author": {
     "name": "Alex Newman"

plugin/package.json

@@ -1,6 +1,6 @@
 {
   "name": "claude-mem-plugin",
-  "version": "7.4.0",
+  "version": "7.4.1",
   "private": true,
   "description": "Runtime dependencies for claude-mem bundled hooks",
   "type": "module",