v3.0.0-rc.2

What's New

• Unified check command: cfv check now validates syntax, enforces schemas, and checks formatting in one pass
• cfv check --fix applies safe fixes (trailing commas, type coercion) and formatting together
• Config resolution redesign: .cfv.toml is sole authority when present; without it, cfv reads existing tool configs per-format
• Removed flags: --no-prettier-config, --no-taplo-config, --no-yamlfmt-config (use --no-config instead)
• --no-config semantics changed: now disables ALL config discovery, not just .cfv.toml
• Documentation rewrite: README, guides, and reference pages updated for v3