feat: slim Footer strip with wordmark, tagline and legal line

components/layout/Footer.tsx

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+import { Wordmark } from '@/components/primitives/Wordmark';
+import { Container } from '@/components/primitives/Container';
+import { footer } from '@/lib/content';
+
+export function Footer() {
+  return (
+    <footer className="bg-bg-dark text-cream border-t border-cream/10">
+      <Container className="flex flex-col items-center gap-3 py-10 text-center md:flex-row md:justify-between md:text-left">
+        <Wordmark size="sm" onDark />
+        <p className="text-sm text-muted-dark">{footer.tagline}</p>
+        <p className="text-xs text-muted-dark">{footer.legal}</p>
+      </Container>
+    </footer>
+  );
+}

components/layout/__tests__/Footer.test.tsx

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+import { render, screen } from '@testing-library/react';
+import { describe, it, expect } from 'vitest';
+import { Footer } from '../Footer';
+
+describe('<Footer />', () => {
+  it('renders the tagline and the legal line', () => {
+    render(<Footer />);
+    expect(screen.getByText('tu estratega de crecimiento')).toBeInTheDocument();
+    expect(screen.getByText(/© 2026 creeer/)).toBeInTheDocument();
+  });
+  it('does not introduce a second h1', () => {
+    render(<Footer />);
+    expect(screen.queryByRole('heading', { level: 1 })).toBeNull();
+  });
+});