Add bnfexpress signed admin client and AI Agent Filament UI

- Modules\Shared\Bnfexpress\BnfexpressAdminClient: HMAC-signed HTTP client
  for bnfexpress's admin API (EV FAQs, agent instructions, chat history),
  with a bnfexpress:smoke-test command and full unit coverage.
- New ai-agent module: Filament pages to manage EV FAQs, publish/roll back
  agent instruction versions, and browse EV chat history + transcripts.
- New manage_ai_agent permission (super_admin/admin).
- Recorded .ai/rules for the client's auth scheme and non-Resource
  Filament page/table testing gotchas.

composer.lock

@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "00ca2f59b7cce7ed3ade4856855a5d51",
+    "content-hash": "947c21682eb62d7b6f63b0f1e11dbe38",
     "packages": [
         {
             "name": "anourvalar/eloquent-serialize",
@@ -4663,6 +4663,38 @@
             },
             "time": "2022-12-02T22:17:43+00:00"
         },
+        {
+            "name": "modules/ai-agent",
+            "version": "1.0",
+            "dist": {
+                "type": "path",
+                "url": "app-modules/ai-agent",
+                "reference": "3a8b4cb091495eaa57bbb80f6879f85a014318bd"
+            },
+            "type": "library",
+            "extra": {
+                "laravel": {
+                    "providers": [
+                        "Modules\\AiAgent\\Providers\\AiAgentServiceProvider"
+                    ]
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Modules\\AiAgent\\": "src/",
+                    "Modules\\AiAgent\\Tests\\": "tests/",
+                    "Modules\\AiAgent\\Database\\Factories\\": "database/factories/",
+                    "Modules\\AiAgent\\Database\\Seeders\\": "database/seeders/"
+                }
+            },
+            "license": [
+                "proprietary"
+            ],
+            "transport-options": {
+                "symlink": true,
+                "relative": true
+            }
+        },
         {
             "name": "modules/booking",
             "version": "1.0",