refactor(builtin-skills): load shared skill templates

src/features/builtin-skills/skill-file-loader.ts

@@ -0,0 +1,28 @@
+import { readFileSync } from "node:fs"
+import { join } from "node:path"
+import { parseFrontmatter } from "../../shared/frontmatter"
+
+type SkillFileReader = (path: string, encoding: "utf8") => string
+
+export function createSharedSkillTemplateLoader(readFile: SkillFileReader = readFileSync): (skillName: string) => string {
+	const cache = new Map<string, string>()
+
+	return (skillName) => {
+		const cached = cache.get(skillName)
+		if (cached !== undefined) {
+			return cached
+		}
+
+		const skillPath = join(import.meta.dir, "..", "..", "..", "packages", "shared-skills", "skills", skillName, "SKILL.md")
+		const content = readFile(skillPath, "utf8")
+		const { body } = parseFrontmatter(content)
+		cache.set(skillName, body)
+		return body
+	}
+}
+
+const loadSharedSkillTemplateFromDisk = createSharedSkillTemplateLoader()
+
+export function loadSharedSkillTemplate(skillName: string): string {
+	return loadSharedSkillTemplateFromDisk(skillName)
+}