Agent Skills: lisa-github-write-issue

Creates or updates a GitHub Issue following the same organizational best practices as lisa-jira-write-ticket — three-audience description, Gherkin acceptance criteria, parent sub-issue (Epic/Story hierarchy), explicit relationship discovery, remote links, labels for status/components/priority/story-points, Validation Journey, and optional GitHub ProjectV2 coordination through lisa-github-project-v2 while keeping the Issue as the lifecycle source of truth. Uses the `gh` CLI exclusively (no MCP). Rejects thin issues. The GitHub counterpart of lisa-jira-write-ticket.