merge(worktree): individualise article costs with per-country Eurostat data + tiered proxy tenant work

# Conflicts:
#	CHANGELOG.md
#	transform/sqlmesh_padelnomics/models/foundation/dim_cities.sql
#	transform/sqlmesh_padelnomics/models/foundation/dim_locations.sql

transform/sqlmesh_padelnomics/models/foundation/dim_cities.sql

@@ -5,7 +5,7 @@
 -- Conformed dimension: used by city_market_profile and all pSEO serving models.
 -- Integrates four sources:
 --   dim_venues           → city list, venue count, coordinates (Playtomic + OSM)
---   stg_income           → country-level median income (Eurostat)
+--   foundation.dim_countries → country_name_en, country_slug, median_income_pps
 --   stg_city_labels      → Eurostat city_code → city_name mapping (EU cities)
 --   stg_population       → Eurostat city-level population (EU, joined via city code)
 --   stg_population_usa   → US Census ACS place population
@@ -41,12 +41,6 @@ venue_cities AS (
   WHERE city IS NOT NULL AND LENGTH(city) > 0
   GROUP BY country_code, city
 ),
--- Latest country income per country
-country_income AS (
-  SELECT country_code, median_income_pps, ref_year AS income_year
-  FROM staging.stg_income
-  QUALIFY ROW_NUMBER() OVER (PARTITION BY country_code ORDER BY ref_year DESC) = 1
-),
 -- Eurostat EU population: join city labels (code→name) with population values.
 -- QUALIFY keeps only the most recent year per (country, city name).
 eurostat_pop AS (
@@ -108,10 +102,9 @@ SELECT
   vc.country_code,
   vc.city_slug,
   vc.city_name,
-  -- Human-readable country name for pSEO templates and internal linking
-  @country_name(vc.country_code)                             AS country_name_en,
-  -- URL-safe country slug
-  @country_slug(vc.country_code)                             AS country_slug,
+  -- Human-readable country name and slug — from dim_countries (single source of truth)
+  c.country_name_en,
+  c.country_slug,
   vc.centroid_lat                                            AS lat,
   vc.centroid_lon                                            AS lon,
   -- Population cascade: Eurostat EU > US Census > ONS UK > GeoNames string > GeoNames spatial > 0.
@@ -133,13 +126,13 @@ SELECT
     0
   )::INTEGER                                                 AS population_year,
   vc.padel_venue_count,
-  ci.median_income_pps,
-  ci.income_year,
+  c.median_income_pps,
+  c.income_year,
   -- GeoNames ID: FK to dim_locations / location_opportunity_profile.
   -- String match preferred; spatial fallback used when name doesn't match (Milano→Milan, etc.)
   COALESCE(gn.geoname_id, gs.spatial_geoname_id)            AS geoname_id
 FROM venue_cities vc
-LEFT JOIN country_income ci ON vc.country_code = ci.country_code
+LEFT JOIN foundation.dim_countries c ON vc.country_code = c.country_code
 -- Eurostat EU population (via city code→name lookup)
 LEFT JOIN eurostat_pop ep
   ON vc.country_code = ep.country_code