docs: generalized interactivity design proposal

[jpage-godaddy]

Summary

• Generalizes the Interactive Domain Purchase Wizard proposal into a consistent pattern for interactivity across all gddy commands, triggered by missing required inputs rather than one-off wizards.
• Proposes --interactive/--non-interactive flags, defaulted by TTY detection the same way --output already is.
• Leaves library selection as an open question for discussion: inline/scrollback prompt libraries (inquire, dialoguer, promkit) vs. full-screen TUI (ratatui, cursive), with pros/cons of each and no recommendation locked in yet.

Test plan

• N/A — documentation only, no code changes
• Design discussion / feedback from reviewers on the open library-selection question

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR adds design documentation proposing a consistent, CLI-wide approach to interactive prompting (driven by missing required inputs), and includes a detailed domain purchase wizard concept as a concrete motivating example.

Changes:

• Adds a comprehensive “Interactive Domain Purchase Wizard” design doc with flow diagrams, UX mockups, and API/command mapping.
• Adds a “Generalized Interactivity Design” doc proposing --interactive / --non-interactive behavior and outlining TUI library options/tradeoffs.

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated no comments.

File	Description
docs/design/interactive_domain_wizard.md	Detailed wizard proposal for interactive domain registration/purchase, including API surface, flows, and agent + non-interactive mapping.
docs/design/generalized_interactivity_design.md	Generalizes interactivity entry/trigger rules across commands and discusses prompt/TUI library approaches.

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