feat: add UserId value object and update ClassifiedAd to use it

.agent/current-plan.md

@@ -1,35 +1,27 @@
-# Plan: ClassifiedAd Domain Entity
+# Plan: UserId Value Object
 
 ## Status: COMPLETED
 
 ## Objective
-Create the first Domain Entity representing a ClassifiedAd with the specified attributes.
+Create a UserId value object in the marketplace domain with an immutable UUID value.
 
 ## Decisions Made
-- **Location**: `domain/marketplace/classified_ad.py`
+- **Location**: `domain/marketplace/user_id.py`
 - **Class style**: `@dataclass(frozen=True)` for immutability
-- **Validation**: No validation, just hold data
-- **Tests**: Yes, create unit tests
+- **Tests**: Yes
 
-## Entity Structure
+## Value Object Structure
 ```python
 @dataclass(frozen=True)
-class ClassifiedAd:
-    id: UUID
-    _ownerId: UUID
-    title: str
-    text: str
-    _price: Decimal
+class UserId:
+    value: UUID
 ```
 
 ## Files Created
-- `domain/__init__.py`
-- `domain/marketplace/__init__.py`
-- `domain/marketplace/classified_ad.py`
-- `tests/test_classified_ad.py`
-- `pyproject.toml`
+- `domain/marketplace/user_id.py`
+- `tests/test_user_id.py`
 
 ## Test Results
-- `test_classified_ad_creation` - PASSED
-- `test_classified_ad_is_immutable` - PASSED
-- `test_classified_ad_equality` - PASSED
+- `test_user_id_creation` - PASSED
+- `test_user_id_is_immutable` - PASSED
+- `test_user_id_equality` - PASSED