Add ConfigBuilder class to accumulate wizard answers into config objects with YAML
serialization, and renderSummary function to display configuration summary. Includes
9 test cases covering provider setup, channel configuration, and feature flags.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Created a Prompter interface and factory function for interactive CLI prompts:
- ask(): text input with optional default values
- confirm(): yes/no confirmation with default
- choose(): numbered menu selection with fallback
- password(): text input (no echo planned in TUI)
- println(): simple output helper
All 9 tests pass (ask, confirm, choose, password scenarios).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
William Valentin