Function relFor

src/workspaces/issues/mutate.ts:79–79

(id: string)

  | { ok: false; reason: 'invalid'; error: string }

const relFor = (id: string): string => join(ISSUES_DIR_REL, `${id}.md`)

/** A valid issue id / filename stem — kebab-ish, no path separators (the file
 *  service guards traversal too, but reject early with a clear reason). */