Fix CRLF handling in sync-agent-rules.sh for Windows

Multi-URL cloning, CI quality gates, cross-platform improvements

Multi-platform AI agent support: 13 coding agents with sync scripts

Project hygiene: issue templates, PR template, changelog, package met…

…adata

Initial release: base template with /clone-website skill, Next.js 16,…

… shadcn/ui, Tailwind v4