fix: add mempalace-mcp console entry point for pipx/uv compatibility

The MCP server config used `python -m mempalace.mcp_server` which fails
when mempalace is installed via pipx or uv, since the system python
cannot find the module in the isolated venv. Adding a `mempalace-mcp`
console_scripts entry point ensures the MCP server works regardless of
installation method (pip, pipx, uv, conda).

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

.codex-plugin/plugin.json

@@ -21,11 +21,7 @@
   "hooks": "./hooks.json",
   "mcpServers": {
     "mempalace": {
-      "command": "python3",
-      "args": [
-        "-m",
-        "mempalace.mcp_server"
-      ]
+      "command": "mempalace-mcp"
     }
   },
   "interface": {