fix: Windows encoding in setup.py and missing imports in CLI modules

[pamaldi]

Summary

Fix Unicode encoding errors on Windows and missing imports in CLI modules.

Problem

• setup.py uses emoji characters (✅, ⚠️) in print statements that fail
  on Windows terminals using cp1252 encoding, breaking pip install -e . and pip install .
• cli_agent.py is missing imports for Progress, SpinnerColumn, TextColumn,
  yaml, and configure_workspace_logging
• cli_network.py is missing the show_banner import

Changes

• setup.py: Added safe_print() function that catches UnicodeEncodeError
  and falls back to ASCII-safe output
• cli_agent.py: Added missing imports from rich.progress, yaml,
  and configure_workspace_logging from cli_helpers
• cli_network.py: Added show_banner import from cli

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