feat: update tag workflow

src/frontmatter/validateFrontmatter.test.ts

@@ -107,6 +107,8 @@ title: [unterminated
 		);
 		expect(unknown).toHaveLength(1);
 		expect(unknown[0].message).toMatch(/nope/i);
+		expect(unknown[0].code).toBe("unknown-tag");
+		expect(unknown[0].tag).toBe("nope");
 	});
 
 	it("does not warn when all tags are known", () => {