fix: separate console streams for proper stdout/stderr routing

Create separate Console instances for regular CLI output (stdout) and
error handling (stderr). This ensures:
- Logo, help, and normal UI go to stdout (console)
- Error tracebacks and error messages go to stderr (err_console)

Follows Unix conventions for proper stream separation without mixing
normal program output with error diagnostics.

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

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

Author: pyq

src/mcpm/cli.py

@@ -31,7 +31,8 @@
 from mcpm.utils.logging_config import setup_logging
 from mcpm.utils.rich_click_config import click, get_header_text
 
-console = Console()
+console = Console()          # stdout for regular CLI output
+err_console = Console(stderr=True)  # stderr for errors/tracebacks
 client_config_manager = ClientConfigManager()
 
 # Setup Rich logging early - this runs when the module is imported
@@ -53,9 +54,9 @@ def wrapper(*args, **kwargs):
         try:
             return func(*args, **kwargs)
         except Exception:
-            console.print(Traceback(show_locals=True))
-            console.print("[bold red]An unexpected error occurred.[/bold red]")
-            console.print(
+            err_console.print(Traceback(show_locals=True))
+            err_console.print("[bold red]An unexpected error occurred.[/bold red]")
+            err_console.print(
                 "Please report this issue on our GitHub repository: "
                 "[link=https://github.com/pathintegral-institute/mcpm.sh/issues]https://github.com/pathintegral-institute/mcpm.sh/issues[/link]"
             )