feat: add Chocolatey package for Windows distribution

[rianjs]

Summary

Add Chocolatey package definition to enable Windows users to install confluence-cli via:

choco install confluence-cli

Package Structure

packaging/
├── chocolatey/
│   ├── confluence-cli.nuspec    # Package manifest
│   ├── tools/
│   │   ├── chocolateyInstall.ps1    # Download + install script
│   │   └── chocolateyUninstall.ps1  # Cleanup script
│   └── README.md                # Publishing instructions
└── homebrew/
    └── README.md                # Points to GoReleaser config

Features

• Downloads from GitHub Releases - binaries not embedded in package
• ARM64 support - native architecture detection via $env:PROCESSOR_ARCHITECTURE
• Dynamic checksums - fetches checksums.txt at install time, no package updates needed per release
• Proper shimming - only cfl.exe is shimmed, LICENSE/README excluded via .ignore files

Architecture Detection

if ($env:PROCESSOR_ARCHITECTURE -eq 'ARM64') {
    # Download windows_arm64.zip
} elseif ([Environment]::Is64BitOperatingSystem) {
    # Download windows_amd64.zip
} else {
    # Error: 32-bit not supported
}

CI Testing

Added .github/workflows/test-chocolatey.yml that runs on Windows:

1. Builds cfl.exe locally
2. Packs the Chocolatey package
3. Installs locally with choco install confluence-cli -s .
4. Verifies cfl --version works
5. Tests uninstall removes the binary

Triggers on PRs/pushes that modify packaging/chocolatey/**.

Publishing Process

Documented in packaging/chocolatey/README.md:

1. Update version in nuspec
2. choco pack
3. Test locally with choco install confluence-cli -s . --force
4. choco push to Chocolatey Community Repository

Also Included

• packaging/homebrew/README.md - documents that Homebrew is managed by GoReleaser
• Updated CLAUDE.md with packaging section

Closes #71