feat: add non-technical user onboarding

- setup.sh: interactive wizard for Docker check and auth configuration
- launch.sh: folder-picker launcher (macOS native dialog, zenity/kdialog on Linux, text fallback)
- launch.bat: Windows launcher using PowerShell folder browser + Git Bash
- claude.sh: friendlier error messages with actionable links; prompt setup.sh if .env missing
- hooks/pre-commit: add setup.sh and launch.sh to executable enforcement
- README: add Quick Start section aimed at non-technical users

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

launch.sh

@@ -0,0 +1,62 @@
+#!/usr/bin/env bash
+# launch.sh — Pick a project folder and start Claude Code
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+# ─── First-time setup ─────────────────────────────────────────────────────────
+if [[ ! -f "$SCRIPT_DIR/.env" ]]; then
+    echo "Looks like this is your first time. Running setup..."
+    echo ""
+    "$SCRIPT_DIR/setup.sh" || exit 1
+    echo ""
+fi
+
+# ─── Folder picker ────────────────────────────────────────────────────────────
+pick_folder() {
+    if [[ "$OSTYPE" == "darwin"* ]]; then
+        # macOS — native Finder dialog
+        osascript -e \
+            'tell application "Finder" to POSIX path of (choose folder with prompt "Select the project folder to work on:")' \
+            2>/dev/null | tr -d '\n'
+    elif command -v zenity &>/dev/null; then
+        # Linux — GNOME/GTK dialog
+        zenity --file-selection --directory \
+            --title="Select your project folder" 2>/dev/null
+    elif command -v kdialog &>/dev/null; then
+        # Linux — KDE dialog
+        kdialog --getexistingdirectory "$HOME" \
+            --title "Select your project folder" 2>/dev/null
+    else
+        echo ""
+    fi
+}
+
+folder=$(pick_folder || true)
+
+# Fallback: text prompt (no GUI available, or user cancelled dialog)
+if [[ -z "$folder" ]]; then
+    echo "Enter the path to your project folder"
+    echo "(Tip: you can drag the folder into this window, then press Enter)"
+    echo ""
+    read -rp "> " folder
+    # Clean up: strip surrounding quotes and trailing whitespace from drag-and-drop
+    folder="${folder%"${folder##*[![:space:]]}"}"
+    folder="${folder#\'}" ; folder="${folder%\'}"
+    folder="${folder#\"}" ; folder="${folder%\"}"
+    # Expand ~ to home directory
+    folder="${folder/#\~/$HOME}"
+fi
+
+if [[ -z "$folder" ]]; then
+    echo "No folder selected. Exiting."
+    exit 1
+fi
+
+if [[ ! -d "$folder" ]]; then
+    echo "Folder not found: $folder"
+    exit 1
+fi
+
+cd "$folder"
+exec "$SCRIPT_DIR/claude.sh" start