feat: add TypeScript installation wizard with @clack/prompts TUI

Replace bash mosaic-init with a modern 9-stage wizard:
- SOUL.md identity, USER.md profile, TOOLS.md configuration
- Runtime detection (Claude, Codex, OpenCode) + MCP setup
- Skills catalog with categorized selection
- Quick Start and Advanced modes
- HeadlessPrompter for --non-interactive and CI usage
- ConfigService abstraction layer for future DB migration
- Bundled as single dist/mosaic-wizard.mjs via tsdown
- mosaic init now prefers wizard when Node.js is available
- 30 tests covering stages, templates, and integration

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

bin/mosaic

@@ -277,6 +277,12 @@ launch_yolo() {
 
 # Delegate to existing scripts
 run_init() {
+  # Prefer wizard if Node.js and bundle are available
+  local wizard_bin="$MOSAIC_HOME/dist/mosaic-wizard.mjs"
+  if command -v node >/dev/null 2>&1 && [[ -f "$wizard_bin" ]]; then
+    exec node "$wizard_bin" "$@"
+  fi
+  # Fallback to legacy bash wizard
   check_mosaic_home
   exec "$MOSAIC_HOME/bin/mosaic-init" "$@"
 }