Phase 4: implement full static site (Eleventy, 15 pages, CSS, JS)

src/_includes/components/cta-band.njk

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+<section class="cta-band" aria-label="Call to action">
+  <div class="cta-band__inner">
+    <p class="section-eyebrow">Ready to get started?</p>
+    <h2 class="cta-band__title">Let's talk about your project.</h2>
+    <p class="cta-band__sub">Diana responds within 1&ndash;2 business days.</p>
+    <a href="/contact/" class="btn btn--ghost-white">Request a Quote</a>
+  </div>
+</section>