feat(tools): persona selector across standalone tools + dashboard chat

Wire the legal-domain persona picker into corpus, deep-research, korrespond and
the dashboard chat. Each endpoint reads the chosen profile, resolves its packages
against client 57, and scopes retrieval via package_ids (falling back to family
when omitted). New dashboard tenants now subscribe to all DBN domain packages so
persona switching survives the subscription intersection.

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

api/korrespond.php

@@ -174,8 +174,12 @@ try {
     $ftRemaining = dbnToolsFreeTierDeduct($ftUid, 'korrespond');
     $creditDeducted = true;
 
+    $personaSlug = (isset($input['profile']) && is_string($input['profile']) && trim($input['profile']) !== '')
+        ? trim($input['profile'])
+        : null;
+
     // ── Pass 2: retrieve law → draft → self-check → translate ──────────────────
-    $result = $agent->generate($intake, $classify, $emit, $engine);
+    $result = $agent->generate($intake, $classify, $emit, $engine, $personaSlug);
     $result['ok']         = true;
     $result['latency_ms'] = (int)round((microtime(true) - $startTime) * 1000);
     if ($ftRemaining >= 0) {