chore(meta): update changelog

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

CHANGELOG.md

@@ -6,6 +6,9 @@ Format based on [Keep a Changelog](https://keepachangelog.com/).
 
 ## [Unreleased]
 
+### Changed
+- **Rivers read like rivers** (T-1175) — map courses now taper to a point at their upstream source instead of starting at full width (the classic cartographic river grammar), and the stream/tributary/trunk width ladder was retuned so a tributary joining a trunk visibly reads as a join. Part of the map-fluency polish pass benchmarked against the best-in-class world maps
+
 ### Fixed
 - **Climate now respects latitude on both hemispheres** (T-1186) — a sign-convention bug made every northern hemisphere read as polar (+90°) and the southern hemisphere read as compressed northern tropics: temperate lakes at 76°S, ice only at the top of the world map. Temperature baselines, glaciation, and everything derived from them now band correctly north AND south of the equator — the same spot near the antarctic circle that used to derive as an 18 °C ice-free lake now comes out at 2 °C under light glaciation
 - **Lakes deepen from the shore** (T-1188) — lake shorelines no longer render as hard flat-blue step-edges: every lake cell now carries its settled-hydrology depth band, and the map shades lakes from pale at the water's edge to dark at the deepest point of the basin — the same visual grammar ocean coastlines already had — each lake shaded relative to its own deepest point, so shallow ponds and deep basins both read correctly. (Game version 0.4.0 → 0.4.2: old on-disk map caches refresh automatically)