feat(tools): persona-driven multi-domain corpus + model routing

Generalize the family-locked legal tools into caveauAI persona profiles
(client 57 chat profiles, resolved in-process via the chat_profiles bridge).
Each tool accepts an optional `profile` slug that scopes the corpus package(s),
search method, system prompt and synthesis model; omitting it falls back to the
family-legal package so existing behaviour is unchanged.

- dbnToolsResolvePersona / dbnToolsListPersonas / dbnToolsBootChatProfiles in
  bootstrap.php; new api/personas.php + dbn.list_personas MCP tool.
- LegalTools search/ask/corpusContextForSummarize and the BvjAnalyzer /
  LegalAnalysis / translate paths take the persona's packages + prompt + model.
- Persona <select> on ask/search/summarize (populated from api/personas.php).

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

includes/BvjAnalyzerAgent.php

@@ -34,11 +34,25 @@ final class DbnBvjAnalyzerAgent
     private array $uploadVecs  = [];
     private array $stepTimings = [];
 
+    /** Persona slug driving package selection + the legal-check system prompt; default = child-welfare. */
+    private string $personaSlug = 'child-welfare';
+    /** Resolved persona system prompt (set in run()); null ⇒ built-in barnevern prompt. */
+    private ?string $resolvedPersonaPrompt = null;
+
     public function __construct(DbnAzureOpenAiGateway|DbnBedrockGateway|null $azure = null)
     {
         $this->azure = $azure ?: DbnGatewayFactory::makeForTool('barnevernet-analyze');
     }
 
+    public function withPersona(?string $slug): self
+    {
+        $slug = is_string($slug) ? trim($slug) : '';
+        if ($slug !== '') {
+            $this->personaSlug = $slug;
+        }
+        return $this;
+    }
+
     /**
      * Main pipeline. At least 1 uploaded file is required.
      *
@@ -71,7 +85,12 @@ final class DbnBvjAnalyzerAgent
         }
 
         $client  = dbnToolsRequireClient();
-        $package = $this->requireFamilyPackage((int)$client['id']);
+        $persona     = dbnToolsResolvePersona((int)$client['id'], $this->personaSlug);
+        $package     = $persona['package'] ?? $this->requireFamilyPackage((int)$client['id']);
+        $packageIds  = $persona['package_ids'] ?: [(int)$package['id']];
+        $this->resolvedPersonaPrompt = is_string($persona['system_prompt'] ?? null) && trim($persona['system_prompt']) !== ''
+            ? $persona['system_prompt']
+            : null;
 
         dbnToolsBootCaveau();
         $aiPortalRoot = dbnToolsAiPortalRoot();
@@ -265,7 +284,7 @@ final class DbnBvjAnalyzerAgent
                     [
                         'search_private'          => false,
                         'search_shared'           => true,
-                        'package_ids'             => [(int)$package['id']],
+                        'package_ids'             => $packageIds,
                         'shared_doc_ids'          => $sharedDocIds,
                         'chunk_limit'             => $controls['chunk_limit'],
                         'search_method'           => 'hybrid',
@@ -964,7 +983,8 @@ PROMPT;
         if ($engine !== 'dbn_legal_v3') {
             $checkFindings = dbnToolsRunLegalCheck(
                 (string)($json['advocacy_brief'] ?? ''),
-                $docType
+                $docType,
+                $this->resolvedPersonaPrompt
             );
             if (!empty($checkFindings)) {
                 if (!is_array($json['procedural_red_flags'] ?? null)) {