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.bat

@@ -0,0 +1,55 @@
+@echo off
+:: launch.bat — Pick a project folder and start Claude Code (Windows)
+setlocal enabledelayedexpansion
+
+set "SCRIPT_DIR=%~dp0"
+set "SCRIPT_DIR=%SCRIPT_DIR:~0,-1%"
+
+:: ── Check for bash (Git Bash or WSL) ─────────────────────────────────────────
+where bash >nul 2>&1
+if %errorlevel% neq 0 (
+    echo Git Bash is required to run docker-claude on Windows.
+    echo.
+    echo Download it at: https://git-scm.com/download/win
+    echo Install with default options, then double-click this file again.
+    pause
+    exit /b 1
+)
+
+:: ── First-time setup ──────────────────────────────────────────────────────────
+if not exist "%SCRIPT_DIR%\.env" (
+    echo Looks like this is your first time. Running setup...
+    echo.
+    bash "%SCRIPT_DIR%/setup.sh"
+    if %errorlevel% neq 0 ( pause & exit /b 1 )
+    echo.
+)
+
+:: ── Folder picker via PowerShell ──────────────────────────────────────────────
+set "PROJECT_FOLDER="
+for /f "usebackq tokens=*" %%i in (`powershell -NoProfile -Command ^
+    "Add-Type -AssemblyName System.Windows.Forms; ^
+     $d = New-Object System.Windows.Forms.FolderBrowserDialog; ^
+     $d.Description = 'Select the project folder to work on'; ^
+     $d.RootFolder = 'MyComputer'; ^
+     $d.ShowNewFolderButton = $false; ^
+     if ($d.ShowDialog() -eq 'OK') { Write-Output $d.SelectedPath } else { exit 1 }"`) do (
+    set "PROJECT_FOLDER=%%i"
+)
+
+if not defined PROJECT_FOLDER (
+    echo No folder selected. Exiting.
+    pause
+    exit /b 1
+)
+
+:: ── Launch ────────────────────────────────────────────────────────────────────
+:: Convert Windows path to Unix path for bash
+for /f "usebackq tokens=*" %%i in (`bash -c "cygpath -u '!PROJECT_FOLDER!'"`) do (
+    set "UNIX_FOLDER=%%i"
+)
+
+bash -c "cd '!UNIX_FOLDER!' && '!SCRIPT_DIR:/=\..\..\!/claude.sh' start" 2>nul || ^
+bash -c "cd '!UNIX_FOLDER!' && bash '$(cygpath -u '!SCRIPT_DIR!')/claude.sh' start"
+
+pause