docs: Add CLAUDE.md for Claude Code guidance

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+
+This is **dockur/windows** - a Docker container that runs Windows inside QEMU with KVM acceleration. It provides automatic Windows installation with ISO downloading, VirtIO driver injection, and unattended setup via answer files.
+
+## Architecture
+
+### Entry Point & Script Chain
+
+The container starts via `/run/entry.sh` which sources scripts in sequence:
+1. `start.sh` → `utils.sh` → `reset.sh` → `server.sh` → `define.sh` → `mido.sh` → `install.sh`
+2. Then: `disk.sh` → `display.sh` → `network.sh` → `samba.sh` → `boot.sh` → `proc.sh` → `power.sh` → `memory.sh` → `config.sh` → `finish.sh`
+3. Finally launches `qemu-system-x86_64` with constructed arguments
+
+### Key Components
+
+- **src/define.sh**: Version parsing, language mapping, and Windows edition detection. Maps user-friendly version strings (e.g., "11", "10l", "2022") to internal identifiers
+- **src/mido.sh**: Microsoft ISO downloader - scrapes Microsoft's download portal to get direct ISO links
+- **src/install.sh**: ISO extraction, image detection, driver injection, answer file customization, and ISO rebuilding using `wimlib-imagex` and `genisoimage`
+- **src/samba.sh**: Configures Samba for host-guest file sharing (appears as "Shared" folder on desktop)
+- **assets/*.xml**: Unattended answer files for different Windows versions
+
+### Build System
+
+- Base image: `qemux/qemu` (QEMU with web-based VNC viewer)
+- VirtIO drivers downloaded at build time from `qemus/virtiso-whql`
+- Multi-arch support: amd64 native, arm64 via `dockur/windows-arm`
+
+## Commands
+
+### Linting & Validation
+
+```bash
+# ShellCheck for all shell scripts
+shellcheck -x --source-path=src src/*.sh
+
+# Dockerfile linting
+hadolint Dockerfile
+
+# XML validation (answer files)
+# Uses action-pack/valid-xml in CI
+```
+
+### Building
+
+```bash
+# Build Docker image locally
+docker build -t windows .
+
+# Build with version argument
+docker build --build-arg VERSION_ARG=1.0 -t windows .
+```
+
+### Testing Locally
+
+```bash
+# Run container (requires KVM)
+docker run -it --rm -e "VERSION=11" -p 8006:8006 --device=/dev/kvm --device=/dev/net/tun --cap-add NET_ADMIN -v "${PWD}/storage:/storage" windows
+
+# Access web viewer at http://localhost:8006
+```
+
+## CI/CD
+
+- **check.yml**: Runs on PRs - ShellCheck, Hadolint, XML/JSON/YAML validation
+- **build.yml**: Manual trigger - builds multi-arch image, pushes to Docker Hub and GHCR
+- **test.yml**: Runs check.yml on PRs
+
+ShellCheck exclusions (from CI): SC1091, SC2001, SC2002, SC2034, SC2064, SC2153, SC2317, SC2028
+
+## Key Environment Variables
+
+| Variable | Default | Description |
+|----------|---------|-------------|
+| VERSION | "11" | Windows version (11, 10, 10l, 2022, etc.) or ISO URL |
+| LANGUAGE | "en" | Installation language |
+| USERNAME | "Docker" | Windows username |
+| PASSWORD | "admin" | Windows password |
+| DISK_SIZE | "64G" | Virtual disk size |
+| RAM_SIZE | "4G" | RAM allocation |
+| CPU_CORES | "2" | CPU cores |
+| MANUAL | "" | Set to "Y" for manual installation |
+
+## Adding New Windows Versions
+
+1. Add version aliases in `src/define.sh` `parseVersion()` function
+2. Create answer file in `assets/` named `{version}.xml`
+3. Add driver folder mapping in `src/install.sh` `addDriver()` function