fix: Update notebooks to use public_marts schema

dbt creates mart tables in public_marts schema, not public.
Updated all notebook SQL queries to use the correct schema.

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

notebooks/housing/tenure_breakdown_bar.ipynb

@@ -44,8 +44,8 @@
     "    income_quintile,\n",
     "    total_rental_units,\n",
     "    average_dwelling_value\n",
-    "FROM mart_neighbourhood_housing\n",
-    "WHERE year = (SELECT MAX(year) FROM mart_neighbourhood_housing)\n",
+    "FROM public_marts.mart_neighbourhood_housing\n",
+    "WHERE year = (SELECT MAX(year) FROM public_marts.mart_neighbourhood_housing)\n",
     "  AND pct_owner_occupied IS NOT NULL\n",
     "ORDER BY pct_renter_occupied DESC\n",
     "\"\"\"\n",