feat(homepage): add TrustStrip + GuaranteeBand for trust + risk-reversal

- TrustStrip.astro: single-row, grayscale-on-default / colour-on-hover
  client logo strip under the hero. 6 logos via <img> with explicit
  width/height + loading=lazy (CLS-safe), wraps to 3+3 on mobile.
  Includes sr-only "Trusted by" heading and dark-mode invert filter
  vetted against THEME_ACCESSIBILITY_AUDIT.md. Replaces the older
  ClientLogos placement on the homepage.

- GuaranteeBand.astro: 3-up risk-reversal band wedged between
  PricingTimelineBand and InlineLeadForm. Three claims (30-day
  satisfaction guarantee, no long-term contracts, fixed-price quotes)
  with icon + headline + supporting body. Stacks vertically on mobile.

- public/images/logos/: 6 placeholder SVG wordmarks (plnr, rentec,
  iit-patna, moc-soft, gov-bihar, pscl). Replace at same path with
  real client-supplied artwork when handed off.

- index.astro: wires the two new components, repoints the hero
  scroll indicator to #trust-strip, preserves legacy #client-logos
  anchor for any external deep-links.

src/components/GuaranteeBand.astro

@@ -0,0 +1,140 @@
+---
+/**
+ * GuaranteeBand Component
+ *
+ * Risk-reversal band that sits BETWEEN the PricingTimelineBand and the
+ * InlineLeadForm on the homepage. Its single job is to remove last-mile
+ * objections ("how do I know this won't blow up in my face?") right before
+ * the visitor fills in the lead form below.
+ *
+ * Layout:
+ *   - 3-up icon + claim row on md+
+ *   - Items stack vertically (1 column) on mobile (<md)
+ *   - Each item is a single visual unit: icon → headline → short subtext
+ *
+ * Design tokens:
+ *   - Uses existing tailwind primitives (`primary-*`, `secondary-*`,
+ *     `accent-*`, `rounded-2xl`). No new colours introduced.
+ *   - Dark-mode pairs are taken from the .agents/security-auditor/
+ *     THEME_ACCESSIBILITY_AUDIT.md verified-passing list (e.g.
+ *     `primary-300` on `primary-900/30`, `secondary-200` on
+ *     `secondary-800` — all ≥ AA 4.5:1).
+ *
+ * CLS guard:
+ *   - Each item card has an explicit `min-h-[...]` so the band reserves
+ *     its vertical footprint at first paint, even before icons render.
+ *
+ * The component is intentionally prop-less. The three claims are part of
+ * the brand promise and shouldn't vary across pages; if a future variant
+ * needs different copy, refactor to a `claims` prop then.
+ */
+
+interface ClaimEntry {
+  title: string;
+  body: string;
+  /**
+   * Inline SVG path data (already wrapped in <path>). Kept inline so the
+   * component has no extra HTTP requests and the icons can ride along with
+   * the document's currentColor — no FOUC.
+   */
+  icon: string;
+}
+
+const claims: ClaimEntry[] = [
+  {
+    title: '30-day satisfaction guarantee',
+    body: 'Not happy in the first 30 days post-launch? We rework it on us or refund the engagement fee.',
+    // Shield-check icon
+    icon:
+      '<path stroke-linecap="round" stroke-linejoin="round" stroke-width="1.8" d="M12 3 4.5 6v6c0 4.5 3 8.5 7.5 9.5 4.5-1 7.5-5 7.5-9.5V6L12 3Z"/><path stroke-linecap="round" stroke-linejoin="round" stroke-width="1.8" d="m9 12 2 2 4-4"/>',
+  },
+  {
+    title: 'No long-term contracts',
+    body: 'Month-to-month after delivery. Pause, extend, or wind down — you stay in control of the engagement.',
+    // Document-minus icon
+    icon:
+      '<path stroke-linecap="round" stroke-linejoin="round" stroke-width="1.8" d="M9 12h6M7 21h10a2 2 0 0 0 2-2V7l-5-5H7a2 2 0 0 0-2 2v15a2 2 0 0 0 2 2Z"/><path stroke-linecap="round" stroke-linejoin="round" stroke-width="1.8" d="M13 2v5h5"/>',
+  },
+  {
+    title: 'Fixed-price quotes',
+    body: 'Scope-locked proposals with a clear deliverable and a clear number — no surprise change-orders.',
+    // Currency / receipt icon
+    icon:
+      '<path stroke-linecap="round" stroke-linejoin="round" stroke-width="1.8" d="M12 6v12M8 9h6.5a2.5 2.5 0 0 1 0 5h-5a2.5 2.5 0 0 0 0 5H16"/><circle cx="12" cy="12" r="9" stroke-width="1.8" fill="none"/>',
+  },
+];
+---
+
+<!--
+  Risk-reversal band. Anchor `#guarantees` lets nav / sticky CTA deep-link
+  visitors straight to the promises right above the lead form.
+-->
+<section
+  id="guarantees"
+  class="pt-6 sm:pt-8 pb-14 sm:pb-20 bg-white dark:bg-secondary-900"
+  aria-labelledby="guarantees-heading"
+>
+  <div class="container-wrapper">
+    <div class="max-w-5xl mx-auto">
+      <!-- Visually hidden heading. The three claim titles each read as their
+           own heading inside the cards, so a wrapper heading would be
+           redundant in the visible flow but is still useful for screen
+           readers to anchor the landmark. -->
+      <h2 id="guarantees-heading" class="sr-only">Our guarantees</h2>
+
+      <!--
+        3-up grid.
+        Mobile (<md): single column, items stack with consistent vertical
+          rhythm via `gap-4`.
+        md+        : three equal columns, evenly spaced.
+      -->
+      <ul
+        class="grid grid-cols-1 md:grid-cols-3 gap-4 sm:gap-6"
+        role="list"
+      >
+        {claims.map((claim, index) => (
+          <li class="h-full">
+            <article
+              class="h-full min-h-[140px] sm:min-h-[160px] flex md:flex-col items-start gap-4 sm:gap-5 rounded-2xl border border-secondary-100 dark:border-secondary-700 bg-gradient-to-br from-secondary-50 to-white dark:from-secondary-800 dark:to-secondary-900 p-5 sm:p-6 shadow-sm hover:shadow-md transition-shadow duration-300"
+              data-animate="fade-up"
+              data-delay={String(index * 80)}
+              aria-labelledby={`guarantee-${index}-title`}
+            >
+              <!-- Icon chip -->
+              <div
+                class="flex-shrink-0 w-12 h-12 rounded-xl bg-primary-100 dark:bg-primary-900/40 text-primary-700 dark:text-primary-300 flex items-center justify-center"
+                aria-hidden="true"
+              >
+                <svg
+                  class="w-6 h-6"
+                  viewBox="0 0 24 24"
+                  fill="none"
+                  stroke="currentColor"
+                  set:html={claim.icon}
+                />
+              </div>
+
+              <!-- Copy block. The leading checkmark prefix communicates the
+                   "✓ benefit" rhythm the brief asks for ("'✓ 30-day satisfaction
+                   guarantee', '✓ No long-term contracts', '✓ Fixed-price
+                   quotes'") without relying on an emoji glyph that varies
+                   across platforms. -->
+              <div class="min-w-0">
+                <h3
+                  id={`guarantee-${index}-title`}
+                  class="text-base sm:text-lg font-bold text-secondary-900 dark:text-secondary-100 leading-snug"
+                >
+                  <span class="text-primary-600 dark:text-primary-300" aria-hidden="true">✓</span>
+                  <span class="ml-1">{claim.title}</span>
+                </h3>
+                <p class="mt-2 text-sm sm:text-base text-secondary-600 dark:text-secondary-300 leading-relaxed">
+                  {claim.body}
+                </p>
+              </div>
+            </article>
+          </li>
+        ))}
+      </ul>
+    </div>
+  </div>
+</section>