Improve plugin UX: dropdown approvals, output to .shipspec/, cleanup context.md#1

jsegov merged 2 commits intomainjsegov/shipspec-claude-code-plugin:mainfrom

jonathanjsegovia/shi-50-misc-improvementsjsegov/shipspec-claude-code-plugin:jonathanjsegovia/shi-50-misc-improvementsCopy head branch name to clipboard