feat: enhance agent settlement features and improve data access controls

- Added new section in AGENTS.md detailing learned workspace facts for better understanding of settlement processes.
- Updated AgentNodeDestroyController to remove unnecessary checks for admin users.
- Enhanced AgentSettlement controllers to assert permissions for finance adjustments and bill operations.
- Improved query scopes in AgentSettlement services to ensure proper data access based on admin roles.
- Refactored methods in SettlementPartyEnrichment for better bill row enrichment and data handling.
- Introduced new methods in AdminAgentSettlementScope for managing agent node visibility and finance adjustments.

app/Http/Controllers/Api/V1/Admin/Agent/AgentNodeDestroyController.php

@@ -47,10 +47,6 @@ final class AgentNodeDestroyController extends Controller
             return ApiMessage::errorResponse($request, 'admin.agent_node_has_players_cannot_delete', ErrorCode::ValidationFailed->value, null, 422);
         }
 
-        if (DB::table('admin_user_agents')->where('agent_node_id', $agent_node->id)->exists()) {
-            return ApiMessage::errorResponse($request, 'admin.agent_node_has_admin_users_cannot_delete', ErrorCode::ValidationFailed->value, null, 422);
-        }
-
         if ($service->hasBlockingCustomRoles($agent_node)) {
             return ApiMessage::errorResponse($request, 'admin.agent_node_has_roles_cannot_delete', ErrorCode::ValidationFailed->value, null, 422);
         }