Ensure Story GitHub Issue — Sub-Routine

Purpose

This is an internal sub-routine called by create-story and review-story. Do not invoke directly.

Inputs (set by the calling skill before invoking):

• STORY_FILE_PATH — repo-relative path to the story markdown file (e.g. ${PRD_ROOT}/onboarding/prd.1.onboarding/epics/epic.1.1.quickstart/stories/story.1.1.1.first-task/story.1.1.1.first-task.md; ${PRD_ROOT} defaults to docs/prd)
• EPIC_ISSUE_NUM — parent epic GitHub issue number (integer string, or empty if no parent epic issue exists)

Output (set by this sub-routine, available to the calling skill):

• STORY_ISSUE_NUM — the GitHub issue number for the story (integer string), or empty string on failure

Steps

Step S1: Read Story Frontmatter