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+# AGENTS.md
+
+## Project
+This is an ASP.NET WebForms project in C# targeting .NET Framework 4.8.
+
+## Core rules
+- Do not add VB.NET code.
+- Do not convert WebForms pages to ASP.NET Core.
+- Keep pages as .aspx, .ascx, .master, and C# code-behind.
+- Keep the copied `Styles`, `Scripts`, and `Metronic` folders unchanged unless the user explicitly asks for a cleanup.
+- Do not connect WebForms pages directly to database classes.
+- Pages must use contracts and services from `AppCode`.
+- Use `SIG` as the prefix for new controls/classes.
+- Do not use `SITIC` in new examples, namespaces, or file names.
+- `Site.master` must keep ContentPlaceHolder IDs short: `H`, `C`, `J`.
+- Do not restore the hidden searcher in the header.
+- Keep the header actions button.
+- User data must come from `IUserContextProvider`.
+- Menu data must come from `IMenuProvider`.
+- Login must use `ILoginService`.
+- Search controls must use `IBuscadorCatalogoDataProvider`.
+- `ClsPaginaBase` must only handle session and permissions.
+- Database access must go through `IDomainConnectionResolver` and `IDbConnectionFactory`.
+- Notification channels must go through the notification center contracts.
+
+## Folder rules
+- Configuration files go under `AppCode/Configuration`.
+- Session/user/menu contracts go under `AppCode/Session`.
+- Permission-related code goes under `AppCode/Security`.
+- Business process folders go under `AppCode/Modules` later.
+- Do not create process folders such as Sales/Purchases/Inventory until the user asks.
+
+## Coding style
+- Prefer small contracts and small services.
+- Avoid large static helper classes.
+- Avoid putting SQL in pages or controls.
+- Prefer explicit null checks and clear error messages.