docs: pin the registry counts to the merged evidence commit

Registry PR #68 merged as ee57e71, which is the first commit whose tree
contains the witness evidence packet and the receipt tool. Point the
proof note there so every claim in it holds at the pinned commit.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RMuXK1es7dsRsPtvC5Tkpd

Author: imran-siddique

registry/index.html

@@ -79,7 +79,7 @@ <h1>Check the published history<br>of agent evidence</h1>
     <a href="https://pypi.org/project/trace-verify/"><strong>0.3.1</strong><span>Verifier on PyPI</span></a>
     <a href="#witness"><strong>1</strong><span>External checkpoint receipt</span></a>
   </div>
-  <p class="proof-note">Two published entries and one checkpoint, counted at registry commit <code>6138335</code>. Neither entry is production evidence. Checkpoint 1 has a separately fetched, offline-verified external receipt. PyPI currently publishes <code>trace-verify 0.3.1</code>; the witness receipt tool and its dependency lock are in the registry repository.</p>
+  <p class="proof-note">Two published entries and one checkpoint, counted at registry commit <code>ee57e71</code>. Neither entry is production evidence. Checkpoint 1 has a separately fetched, offline-verified external receipt. PyPI currently publishes <code>trace-verify 0.3.1</code>; the witness receipt tool and its dependency lock are in the registry repository.</p>
 </section>
 
 <section id="problem">