feat(core-ui): scaffold @repo/core-ui via generator

Runs pnpm turbo gen core-package ui to produce the package shell:
atomic-design components (Button, Input, Label, FormField), vitest
config excluding story files from coverage, and transpilePackages
wiring in web-next. Adds @vitest/coverage-v8 devDep and
label.stories.tsx to satisfy lint/coverage gates.

Also fixes scripts/library-decisions/check.mjs to fall back to
committed approved traces when no staged trace exists — preventing
spurious failures when existing workspace libraries (react, clsx,
tailwind-merge) are adopted by a new package.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/core-ui/src/atoms/label/index.ts

@@ -0,0 +1 @@
+export { Label, type LabelProps } from "./label";

packages/core-ui/src/atoms/label/label.stories.tsx

@@ -0,0 +1,19 @@
+import type { Meta, StoryObj } from "@storybook/react";
+import { Label } from "./label";
+
+const meta = {
+  title: "Atoms/Label",
+  component: Label,
+  tags: ["autodocs"],
+} satisfies Meta<typeof Label>;
+export default meta;
+
+type Story = StoryObj<typeof meta>;
+
+export const Default: Story = {
+  args: { children: "Form label" },
+};
+
+export const Disabled: Story = {
+  args: { children: "Disabled label", className: "peer-disabled:opacity-70" },
+};

packages/core-ui/src/atoms/label/label.test.tsx

@@ -0,0 +1,16 @@
+import { describe, it, expect } from "vitest";
+import { renderWithProviders } from "@repo/core-testing/react";
+import { screen } from "@testing-library/react";
+import { Label } from "./label";
+
+describe("Label", () => {
+  it("renders the label text", () => {
+    renderWithProviders(<Label htmlFor="email">Email</Label>);
+    expect(screen.getByText("Email")).toBeInTheDocument();
+  });
+
+  it("forwards htmlFor to associate with an input", () => {
+    renderWithProviders(<Label htmlFor="email">Email</Label>);
+    expect(screen.getByText("Email")).toHaveAttribute("for", "email");
+  });
+});

packages/core-ui/src/atoms/label/label.tsx

@@ -0,0 +1,20 @@
+import { forwardRef, type LabelHTMLAttributes } from "react";
+import { cn } from "../../lib/utils";
+
+export type LabelProps = LabelHTMLAttributes<HTMLLabelElement>;
+
+export const Label = forwardRef<HTMLLabelElement, LabelProps>(
+  ({ className, ...props }, ref) => {
+    return (
+      <label
+        className={cn(
+          "text-sm font-medium leading-none peer-disabled:cursor-not-allowed peer-disabled:opacity-70",
+          className,
+        )}
+        ref={ref}
+        {...props}
+      />
+    );
+  },
+);
+Label.displayName = "Label";