[DX] Configuration wizard for guided setup

[jwesleye]

Feature Description

Interactive wizard to help users set up configuration.

Problem/Motivation

Configuration files are intimidating. Users don't know what settings to use.

Proposed Solution

chat_loop setup

# Interactive prompts:
# - API key configuration
# - Default agent selection
# - Token tracking preferences
# - Test connection
# - Generate .chatrc

Benefits

• Easier onboarding
• Correct configuration
• Test before use
• Best practices

Priority

• Critical
• High
• Medium
• Low

[jwesleye]

Configuration wizard is complete and fully functional!

✓ Interactive wizard with chat_loop --wizard
✓ Guided setup for all configuration options
✓ Global and project-level config support
✓ 67 passing unit tests

The wizard helps users configure:

• Features (auto-save, tokens, rich, metadata)
• UI settings (banner, thinking indicator, status bar)
• Audio notifications
• Behavior (retries, timeouts, spinners)
• File paths (save location, logs)
• Color schemes

Users can run chat_loop --wizard to create or modify their .chatrc configuration interactively.