fix: route CLI error tracebacks to stderr instead of stdout

The console object in cli.py was created without stderr=True, causing
unhandled exception tracebacks to be printed to stdout instead of stderr.
This fix ensures proper error stream routing by configuring the console
to use stderr, matching the behavior of the logging system.

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

Co-Authored-By: Claude <[email protected]>

Author: pyq

src/mcpm/cli.py

@@ -31,7 +31,7 @@
 from mcpm.utils.logging_config import setup_logging
 from mcpm.utils.rich_click_config import click, get_header_text
 
-console = Console()
+console = Console(stderr=True)
 client_config_manager = ClientConfigManager()
 
 # Setup Rich logging early - this runs when the module is imported