feat: TypeScript installation wizard with @clack/prompts TUI (#1)

Co-authored-by: Jason Woltje <jason@diversecanvas.com>
Co-committed-by: Jason Woltje <jason@diversecanvas.com>

USER.md

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+# User Profile
+
+This file defines user-specific context for all agent sessions.
+It is loaded globally and applies regardless of runtime or project.
+
+> **This file has not been personalized yet.**
+> Run `mosaic init` to set up your user profile, or edit this file directly.
+
+## Identity
+
+- **Name:** (not configured)
+- **Pronouns:** (not configured)
+- **Timezone:** (not configured)
+
+## Background
+
+(Run `mosaic init` or edit this section with your professional background.)
+
+## Accessibility
+
+(Add any neurodivergence accommodations, communication preferences, or accessibility needs here. Agents will adapt their behavior based on this section.)
+
+## Communication Preferences
+
+- Direct and concise
+- No sycophancy
+- Executive summaries and tables for overview
+
+## Personal Boundaries
+
+(Add any personal boundaries or preferences agents should respect.)
+
+## Current Projects
+
+| Project | Stack | Registry |
+|---------|-------|----------|
+| (none configured) | | |