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__crime_summary.sql

@@ -64,15 +64,17 @@ crime_summary as (
         w.robbery_count,
         w.theft_over_count,
         w.homicide_count,
-        w.avg_rate_per_100k,
         w.yoy_change_pct,
 
-        -- Crime rate per 100K population
-        case
-            when n.population > 0
-            then round(w.total_incidents::numeric / n.population * 100000, 2)
-            else null
-        end as crime_rate_per_100k
+        -- Crime rate per 100K population (use source data avg, or calculate if population available)
+        coalesce(
+            w.avg_rate_per_100k,
+            case
+                when n.population > 0
+                then round(w.total_incidents::numeric / n.population * 100000, 2)
+                else null
+            end
+        ) as crime_rate_per_100k
 
     from neighbourhoods n
     inner join with_yoy w on n.neighbourhood_id = w.neighbourhood_id