Organize and manage Jira boards, issues, and sprints. Use when the user wants to: (1) List, create, update, or transition Jira issues, (2) View or manage sprints, (3) Assign issues or change status, (4) Query issues with JQL, (5) Manage Jira boards. Requires environment variables JIRA_URL, JIRA_USERNAME, JIRA_API_TOKEN, and optionally JIRA_PROJECTS_FILTER.