Agent Skills: lisa-setup-atlassian

Configure Atlassian access for this project. Installs acli if missing, runs the OAuth or API-token login, optionally enables the Atlassian MCP, resolves the cloudId for the active site, and writes the `atlassian` section into `.lisa.config.json`. Prerequisite for /lisa:setup:jira and /lisa:setup:confluence (both need atlassian.cloudId). Idempotent — re-running updates the existing section rather than duplicating it.