update prompt template

ai/PROMPT_TEMPLATE.md

@@ -1,6 +1,7 @@
 # Entity Creation Prompt Template
 
-Follow the existing patterns in this codebase to create a new entity called [EntityName].
+Follow the existing patterns in this codebase to:
+- create a new entity called [EntityName].
 
 Requirements:
 - The entity encapsulates [one or more Entities]
@@ -25,7 +26,8 @@ Code patterns to follow:
   - Look at tests/Fakes/ for examples
   - Find/lookup methods must return a new instance of the entity, not the stored reference
 - Tests: follow existing patterns in tests/Unit/[Entity]/UseCases/
-- Lines should not exceed 80 columns
+  - In setUp, only use fake repositories for entities under test — construct dependency objects directly with `new` (e.g., `new Event(id: 0, slug: 'test')`) instead of creating them through their fake repositories
+- Lines should not exceed 80 columns, but should use up to 80 columns when possible — do not split lines unnecessarily
 - Imports: always put use statements at the top of the file, never use inline imports (e.g., \App\Foo\Bar::class)
 - Variable names: use explicit, descriptive names — never single-letter or abbreviated variables (e.g., use $sponsorship not $s, $event not $e)