Integrate dbn-legal-agent-v2: upgrade all v1 refs + add Korrespond legal-check

- Replace dbn-legal-agent with dbn-legal-agent-v2 in bootstrap.php
  (dbnToolsRunLegalCheck), DeepResearchAgent.php (interpretSeed,
  expandQueries, synthesis fallback, deploy label), BvjAnalyzerAgent.php
  (check_model label) — 8 locations total
- Add dbn-legal-agent-v2 legal threshold check to KorrespondAgent:
  called after selfCheck() in both generate() and refine(); result
  surfaced as legal_check[] in the API response
- Render legal_check card in korrespond.js using existing bvj-red-flag
  styles; shows only when non-empty
- Add .korr-legal-check CSS block in tools.css

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

assets/js/korrespond.js

@@ -574,6 +574,22 @@
 
       ${data.disclaimer ? `<p class="upload-hint" style="margin-top:16px;font-style:italic">${esc(data.disclaimer)}</p>` : ''}
 
+      ${(data.legal_check && data.legal_check.length) ? `
+      <div class="korr-legal-check">
+        <h4 class="korr-legal-check__title">⚖ Legal threshold check <small>(dbn-legal-agent-v2)</small></h4>
+        ${data.legal_check.map((f) => `
+          <div class="bvj-red-flag">
+            <div class="bvj-red-flag__head">
+              <div class="bvj-red-flag__desc">${esc(f.description || '')}</div>
+              <span class="bvj-severity bvj-severity-${esc(f.severity || 'low')}">${esc(f.severity || 'low')}</span>
+            </div>
+            ${f.legal_basis ? `<span class="bvj-red-flag__legal">${esc(f.legal_basis)}</span>` : ''}
+            ${f.what_to_check ? `<details class="bvj-red-flag__details"><summary>What to verify</summary><p class="bvj-red-flag__check">${esc(f.what_to_check)}</p></details>` : ''}
+          </div>
+        `).join('')}
+      </div>
+      ` : ''}
+
       <section class="korr-refine-panel" id="korrRefinePanel" aria-labelledby="korrRefineTitle">
         <h3 id="korrRefineTitle">${esc(t('refine_title'))} <small>${esc(t('one_extra_credit'))}</small></h3>
         <p class="upload-hint">${esc(t('refine_hint'))}</p>
@@ -682,6 +698,22 @@
             `).join('')}
           </div>
         </details>` : ''}
+
+        ${(data.legal_check && data.legal_check.length) ? `
+        <div class="korr-legal-check">
+          <h4 class="korr-legal-check__title">⚖ Legal threshold check <small>(dbn-legal-agent-v2)</small></h4>
+          ${data.legal_check.map((f) => `
+            <div class="bvj-red-flag">
+              <div class="bvj-red-flag__head">
+                <div class="bvj-red-flag__desc">${esc(f.description || '')}</div>
+                <span class="bvj-severity bvj-severity-${esc(f.severity || 'low')}">${esc(f.severity || 'low')}</span>
+              </div>
+              ${f.legal_basis ? `<span class="bvj-red-flag__legal">${esc(f.legal_basis)}</span>` : ''}
+              ${f.what_to_check ? `<details class="bvj-red-flag__details"><summary>What to verify</summary><p class="bvj-red-flag__check">${esc(f.what_to_check)}</p></details>` : ''}
+            </div>
+          `).join('')}
+        </div>
+        ` : ''}
       </div>
     `;