fix: Use explicit path for .env file loading

load_dotenv() was searching from cwd, which may not be the project root.
Now explicitly passes PROJECT_ROOT / ".env" path.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

scripts/data/load_toronto_data.py

@@ -30,11 +30,11 @@ from typing import Any
 
 from dotenv import load_dotenv
 
-# Load .env file so dbt can access POSTGRES_* environment variables
-load_dotenv()
-
 # Add project root to path
 PROJECT_ROOT = Path(__file__).parent.parent.parent
+
+# Load .env file so dbt can access POSTGRES_* environment variables
+load_dotenv(PROJECT_ROOT / ".env")
 sys.path.insert(0, str(PROJECT_ROOT))
 
 from portfolio_app.toronto.loaders import (  # noqa: E402