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>

includes/KorrespondAgent.php

@@ -257,6 +257,12 @@ PROMPT;
         if ($emit) { $emit('progress', ['detail' => self::L('quality_check', $userLang)]); }
         $checked = $this->selfCheck($draftNo, $retrieval['sources'], $classify, $goal, $tone);
 
+        // ── Legal check: dbn-legal-agent-v2 threshold verification ────────────────
+        $legalCheck = [];
+        try {
+            $legalCheck = dbnToolsRunLegalCheck($checked['draft'], $body);
+        } catch (Throwable $e) { /* silent — non-critical */ }
+
         // ── Translate to user language (if not Norwegian) ───────────────────────
         $draftUser = $checked['draft'];
         if ($userLang !== 'no') {
@@ -278,6 +284,7 @@ PROMPT;
             'draft_user_lang'=> $userLang,
             'cited_law'     => $checked['cited_sources'],
             'self_check'    => $checked['flags'],
+            'legal_check'   => $legalCheck,
             'applicable_acts'=> $classify['applicable_acts'] ?? [],
             'deadlines'     => $classify['deadlines'] ?? [],
             'parties'       => $classify['parties'] ?? [],
@@ -756,6 +763,11 @@ EOT,
         if ($emit) { $emit('progress', ['detail' => self::L('check_and_authorities', $userLang)]); }
         $checked = $this->selfCheck($refinedNo, $retrieval['sources'], $classify, $goal, $tone);
 
+        $legalCheckRefine = [];
+        try {
+            $legalCheckRefine = dbnToolsRunLegalCheck($checked['draft'], $body);
+        } catch (Throwable $e) { /* silent — non-critical */ }
+
         $draftUser = $checked['draft'];
         if ($userLang !== 'no') {
             if ($emit) { $emit('progress', ['detail' => self::L('translating_to', $userLang, ['lang' => dbnToolsLanguageName($userLang)])]); }
@@ -774,6 +786,7 @@ EOT,
             'draft_user_lang'=> $userLang,
             'cited_law'      => $checked['cited_sources'],
             'self_check'     => $checked['flags'],
+            'legal_check'    => $legalCheckRefine,
             'applied_slices' => $retrieval['applied_slices'],
             'disclaimer'     => dbnToolsDisclaimer($userLang),
         ];