Agent Skills: lisa-setup-sonar

Configure the official SonarQube plugin + MCP as Lisa's single Sonar substrate across every supported coding agent. Installs/updates the SonarQube CLI, authenticates (browser login on a dev machine, or SONARQUBE_CLI_TOKEN headless), selects the Test Manager target, runs `sonar integrate <agent>` for each supported agent (Claude, Codex, Cursor, Copilot, Antigravity) and wires the MCP for OpenCode, then writes only non-secret policy to .lisa.config.json. Separate from the CI SonarCloud scan gate, which is unchanged.