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 "$MOSAIC_HOME/bin/mosaic-init" "$@"
 }

bin/mosaic-wizard

@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# mosaic-wizard — Thin shell wrapper for the bundled TypeScript wizard
+MOSAIC_HOME="${MOSAIC_HOME:-$HOME/.config/mosaic}"
+
+# Look for the bundle in the installed location first, then the source repo
+WIZARD_BIN="$MOSAIC_HOME/dist/mosaic-wizard.mjs"
+if [[ ! -f "$WIZARD_BIN" ]]; then
+  WIZARD_BIN="$(cd "$(dirname "$0")/.." && pwd)/dist/mosaic-wizard.mjs"
+fi
+
+if [[ ! -f "$WIZARD_BIN" ]]; then
+  echo "[mosaic-wizard] ERROR: Wizard bundle not found." >&2
+  echo "[mosaic-wizard] Run 'pnpm build' in the mosaic-bootstrap repo, or re-install Mosaic." >&2
+  exit 1
+fi
+
+if ! command -v node >/dev/null 2>&1; then
+  echo "[mosaic-wizard] ERROR: Node.js is required but not found." >&2
+  echo "[mosaic-wizard] Install Node.js 18+ from https://nodejs.org" >&2
+  exit 1
+fi
+
+exec node "$WIZARD_BIN" "$@"