feat(tools): reposition as Do Better Legal two-track Norwegian-law MCP

De-family-ify shared JSON tools (persona-aware routing + neutral base
prompt), make the verification review pick its engine per track
(family/child-welfare -> dbn-legal-agent-v3, others -> gpt-4o interim),
and route product-name strings through dbnToolsProductName(). Rebrand the
MCP/tools surface (mcp.php + i18n mcp_* strings) to Do Better Legal.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

includes/KorrespondAgent.php

@@ -282,7 +282,7 @@ PROMPT;
         if ($emit) { $emit('progress', ['detail' => self::L('legal_check', $userLang)]); }
         $legalCheck = [];
         try {
-            $legalCheck = dbnToolsRunLegalCheck($checked['draft'], $body);
+            $legalCheck = dbnToolsRunLegalCheck($checked['draft'], $body, null, $persona);
         } catch (Throwable $e) { /* silent — non-critical */ }
 
         // ── Translate to user language (if not Norwegian) ───────────────────────
@@ -777,7 +777,8 @@ EOT,
         array $classify,
         string $originalDraftNo,
         string $jurisdiction,
-        ?callable $emit = null
+        ?callable $emit = null,
+        ?string $persona = null
     ): array {
         $body         = $intake['recipient_body'] ?? 'other';
         $outputType   = $intake['output_type'] ?? 'email';
@@ -808,7 +809,7 @@ EOT,
         if ($emit) { $emit('progress', ['detail' => self::L('legal_check', $userLang)]); }
         $legalCheckRefine = [];
         try {
-            $legalCheckRefine = dbnToolsRunLegalCheck($checked['draft'], $body);
+            $legalCheckRefine = dbnToolsRunLegalCheck($checked['draft'], $body, null, $persona);
         } catch (Throwable $e) { /* silent — non-critical */ }
 
         $draftUser = $checked['draft'];