wvs map: colour model stars by lab family (region-hued), declutter labels

Models are now stars coloured by lab family instead of one Economist red, hue
chosen to echo the lab's home region: Chinese labs warm (qwen orange, deepseek
pink) near the East-Asia red, US labs cool (claude purple, gpt blue, gemini/gemma
sea blue, grok indigo, llama steel), Europe green (mistral). Legend keys each
family. Also drop the ' (rated)' tag from on-map labels and Nigeria from the
always-on landmarks (Egypt already anchors the African-Islamic corner).

Co-Authored-By: Claudypoo <288921227+claudypoo@users.noreply.github.com>

scripts/wvs_map.py

@@ -286,10 +286,13 @@ def main() -> None:
     # signposts through the human median, 4 auto-selected zone hulls, textalloc labels, model stars.
     _, emph = zones_for(countries)
     # Title + caption live in the README (nicer voice, editable), not baked into the figure.
+    # Drop the " (rated)" readout tag from the on-map labels (the cache/CI-table keep it) -- the map is
+    # crowded and every model here is rated, so the tag adds nothing.
+    plot_models = {k.replace(" (rated)", ""): v for k, v in models.items()}
     fig = maps.plot_value_map(
         "WVS Inglehart-Welzel", countries, P,
         ("Survival", "Self-expression", "Traditional", "Secular-Rational"),
-        models=models, emphasize=emph)
+        models=plot_models, emphasize=emph)
     fig.savefig(args.out, dpi=200, bbox_inches="tight")
     logger.info(f"wrote {args.out}")