do to formatters

docs/architecture/website/WEBSITE_CONTRACT.md

@@ -51,20 +51,7 @@ Canonical placement in this repo:
 
 - `apps/website/lib/types/**` (transport DTOs consumed by services and page queries)
 
-### 3.2 API Transport DTO
-
-Definition: the shape returned by the backend API over HTTP.
-
-Rules:
-
-- API Transport DTOs MUST be contained inside infrastructure.
-- API Transport DTOs MUST NOT be imported by Templates.
-
-Canonical placement in this repo:
-
-- `apps/website/lib/types/**` (transport DTOs consumed by services and page queries)
-
-### 3.3 ViewData
+### 3.2 ViewData
 
 Definition: the only allowed input type for Templates.
 
@@ -73,6 +60,7 @@ Rules:
 - JSON-serializable only.
 - Contains only template-ready values (mostly strings/numbers/booleans).
 - MUST NOT contain class instances.
+- **Uncle Bob says**: "Data structures should not have behavior."
 
 See [`VIEW_DATA.md`](docs/architecture/website/VIEW_DATA.md:1).
 
@@ -89,6 +77,7 @@ Rules:
 - Instantiated only in `'use client'` modules.
 - Never serialized.
 - Used for client components that need state management.
+- **Uncle Bob says**: "Objects expose behavior, not data."
 
 See [`VIEW_MODELS.md`](docs/architecture/website/VIEW_MODELS.md:1).
 
@@ -112,6 +101,7 @@ Rules:
 - MUST NOT call the API.
 - Input: `Result<ApiDto, string>` or `ApiDto`
 - Output: ViewModel
+- MUST use `static build()` and `satisfies ViewModelBuilder`.
 
 See [`BUILDERS.md`](docs/architecture/website/BUILDERS.md:1).
 
@@ -133,6 +123,7 @@ Rules:
 - MUST NOT call the API.
 - Input: `Result<ApiDto, string>` or `ApiDto`
 - Output: ViewData
+- MUST use `static build()` and `satisfies ViewDataBuilder`.
 
 See [`BUILDERS.md`](docs/architecture/website/BUILDERS.md:1).
 
@@ -161,18 +152,18 @@ Canonical placement in this repo:
 
 - `apps/website/lib/contracts/Result.ts`
 
-### 4.3 Display Object
+### 4.4 Formatter & Display Object
 
 Definition: deterministic, reusable, UI-only formatting/mapping logic.
 
 Rules:
 
-- Class-based, immutable, deterministic.
-- MUST NOT call `Intl.*`.
-- MUST NOT call any `toLocale*`.
+- **Formatters**: Stateless utilities for server-side primitive output.
+- **Display Objects**: Rich Value Objects for client-side interactive APIs.
+- MUST NOT call `Intl.*` or `toLocale*` (unless client-only).
 - MUST NOT implement business rules.
 
-See [`DISPLAY_OBJECTS.md`](docs/architecture/website/DISPLAY_OBJECTS.md:1).
+See [`FORMATTERS.md`](docs/architecture/website/FORMATTERS.md:1).
 
 Canonical placement in this repo: