fix: HomeViewOffensive.vue trust section uses "Open." as a standalone claim (#313)

Replace "Open Source." with "On-Chain." — the repo is private so "open
source" is a false claim per PRODUCT-TRUTH.md §Code/Open Source and
UX-DECISIONS.md §Don't Say. "On-Chain." is accurate and consistent with
the subtitle already present in the section.

Also remove duplicate garbled sentence in the Adaptive Trading card
("The optimizer evolves — new versions ship as the protocol matures."
was a copy-paste repeat of the preceding clause).

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

landing/src/views/HomeViewOffensive.vue

@@ -28,7 +28,7 @@
         <div class="card">
           <div class="card-emoji">⚡</div>
           <h3>Adaptive Trading</h3>
-          <p>KRK owns its own trading infrastructure. The optimizer reads staker sentiment and adapts in real-time — and it evolves. The optimizer evolves — new versions ship as the protocol matures.</p>
+          <p>KRK owns its own trading infrastructure. The optimizer reads staker sentiment and adapts in real-time — new versions ship as the protocol matures.</p>
           <p><a class="card-link" @click="router.push('/docs/how-it-works')">See how it works →</a></p>
         </div>
         <div class="card">
@@ -75,7 +75,7 @@
       </LeftRightComponent>
     </section>
     <section class="trust-section">
-      <h2>Open Source. Transparent. Verifiable.</h2>
+      <h2>On-Chain. Transparent. Verifiable.</h2>
       <p>Built on Base. Every move on-chain. No black boxes, no trust needed.</p>
       <div class="trust-links">
         <KButton outlined @click="router.push('/docs/code')">Source Code</KButton>