Generate release notes for the Backbone (BB) Jira project — runs pre-flight checks to promote stories whose subtasks are all done and to flag partially-ready stories, then fetches all tickets with status 'Ready for deploy' for the selected Stream(s), translates them into user-facing release-note entries, produces both a Confluence-table format and a Slack-post format, and offers a Slack deeplink to publish in one click. Only trigger when the user explicitly invokes this skill by name (e.g., '/backbone-release-notes', 'run backbone-release-notes', 'use backbone-release-notes'). Do NOT trigger on requests to write or summarize individual stories — use backbone-full-story, b…
