vstack 4.7.1

What's Changed

• fix(issue-428): linear skill: issues create --parent is silently ignored (sub-issue not linked) by Brad (@bmethod) in #430
• fix(issue-431): lease worktree push after auto-rebase by Brad (@bmethod) in #432
• fix(issue-433): agent installs without hooks omit hook frontmatter by Brad (@bmethod) in #436
• fix(issue-435): Clarify skill-failure reporting for non-VStack skills by Brad (@bmethod) in #437

Full Changelog: v4.7.0...v4.7.1