Fix category budget overlaps and document the uv run test workflow.

AGENTS.md

@@ -7,15 +7,17 @@
 uv sync
 
 # Run migrations
-alembic upgrade head
+uv run alembic upgrade head
 
 # Run all tests
-pytest
+uv run pytest
 
 # Run a single test file
-pytest tests/test_model_b4wexport.py -v
+uv run pytest tests/test_model_b4wexport.py -v
 ```
 
+Use `uv run` for project commands so they use the project-managed Python environment and dependencies.
+
 ## Project Structure
 
 - **`src/`**: Application code
@@ -53,10 +55,10 @@ with get_session() as session:
 
 ```bash
 # Tests automatically run migrations via conftest fixture
-pytest tests/ -v --tb=short
+uv run pytest tests/ -v --tb=short
 
 # To test without migrations (in-memory SQLite), use DATABASE_URL="sqlite://"
-export DATABASE_URL="sqlite://" pytest tests/test_db.py
+DATABASE_URL="sqlite://" uv run pytest tests/test_db.py
 ```
 
 ### Environment Variables
@@ -129,7 +131,7 @@ item = B4wExportFactory.build(  # build() for partial, create() for full
 
 ## Testing Tips
 
-- Run single test: `pytest tests/test_model_b4wexport.py -v`
+- Run single test: `uv run pytest tests/test_model_b4wexport.py -v`
 - View migrations: `ls alembic/versions/`
 - Test data location: `/scripts/dummy_data/`