Documentation

• Homebrew 6 requires a one-time brew trust jchultarsky101/pcli2 - Homebrew 6.0 refuses to load formulae from any tap that has not been trusted, so brew install and brew upgrade pcli2 stop with "Refusing to load formula ... from untrusted tap" until the tap is trusted once per machine and user. The README and install guide now say so, including the HOMEBREW_NO_REQUIRE_TAP_TRUST=1 escape hatch for CI. The installers, MSI and pcli2-update are unaffected.