Create a pull request with auto-generated description from workflow artifacts — reads impl-summary, test-summary, and review verdict from .devt/state/

<tool_restrictions> This workflow uses: Bash, Read, Glob, Grep </tool_restrictions>

<objective> Create a pull request with a rich, auto-generated description composed from the completed workflow's .devt/state/ artifacts (impl-summary.md, test-summary.md, review.md, decisions.md). </objective>

<execution_context> @${CLAUDE_PLUGIN_ROOT}/workflows/ship.md </execution_context>

<process> Execute the ship workflow from the referenced file end-to-end. Reads workflow artifacts, generates PR body, pushes branch, and creates the PR via gh CLI. </process>