chore: changelog + fix stg_population_geonames unicode escapes

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

CHANGELOG.md

@@ -7,10 +7,12 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 ## [Unreleased]
 
 ### Changed
+- **Opportunity Score v6 → v7 (calibration fix)** — two fixes for inflated scores in saturated markets. (1) `dim_locations` now sources venue coordinates from `dim_venues` (deduplicated OSM + Playtomic) instead of `stg_padel_courts` (OSM only), making Playtomic-only venues visible to spatial lookups. (2) Country-level supply saturation dampener on the 40-pt supply deficit component: saturated countries (Spain ~4.5/100k) get dampened supply deficit (×0.55 → 22 pts max), emerging markets (Germany ~0.7/100k) are nearly unaffected (×0.93 → ~37 pts).
 - **Single-score simplification** — consolidated two public-facing scores (Market Score + Opportunity Score) into one **Padelnomics Score** (internally: `opportunity_score`). All maps, tooltips, article templates, and the methodology page now show a single score. Dual-ring markers reverted to single-color markers. `/market-score` route renamed to `/padelnomics-score` (old URL 301-redirects). All `mscore_*` i18n keys replaced with `pnscore_*`. Business plan queries `opportunity_score` from `location_profiles` (replaces legacy `city_market_overview` view). Map tooltip strings now i18n'd via `window.__MAP_T` (12 keys, EN + DE).
 
 ### Fixed
 - **Non-Latin city names on map** — GeoNames entries with CJK/Cyrillic/Arabic characters (e.g. "Seelow" showing Japanese) now filtered in `stg_population_geonames` via Latin-only regex.
+- **GeoNames regex DuckDB compatibility** — replaced Python-style `\u00C0` Unicode escapes in `stg_population_geonames` regex with literal Unicode characters (`À-ɏḀ-ỿ`) for DuckDB compatibility.
 - **Score range safety** — `location_profiles` clamps both scores to 0-100 via `LEAST/GREATEST`.
 - **Pipeline cast fix** — `venue_pricing_benchmarks.sql` defensively casts `snapshot_date` VARCHAR to DATE.