fix: Repair data pipeline with StatCan CMHC rental data

- Add StatCan CMHC parser to fetch rental data from Statistics Canada API
- Create year spine (2014-2025) as time dimension driver instead of census
- Add CMA-level rental and income intermediate models
- Update mart_neighbourhood_overview to use rental years as base
- Fix neighbourhood_service queries to match dbt schema
- Add CMHC data loading to pipeline script

Data now flows correctly: 158 neighbourhoods × 12 years = 1,896 records
Rent data available 2019-2025, crime data 2014-2024

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

scripts/db/init_schema.py

@@ -25,8 +25,10 @@ def main() -> int:
         engine = get_engine()
 
         # Test connection
+        from sqlalchemy import text
+
         with engine.connect() as conn:
-            result = conn.execute("SELECT 1")
+            result = conn.execute(text("SELECT 1"))
             result.fetchone()
         print("Database connection successful")