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>

dbt/models/intermediate/int_neighbourhood__housing.sql

@@ -20,7 +20,7 @@ housing as (
         n.neighbourhood_name,
         n.geometry,
 
-        coalesce(r.year, c.census_year) as year,
+        coalesce(r.year, c.census_year, 2021) as year,
 
         -- Census housing metrics
         c.pct_owner_occupied,