Refresh multilingual benchmarks and fix overlapping gold evaluation

Recompute published benchmark results for all default language models,
exclude Polish Polimorf, add Hebrew documentation, and record the current
benchmark environment. Evaluate repeated surface forms as an overlapping
gold cover and publish only applicable metrics for candidate policies.

docs/builds.md

@@ -0,0 +1,3 @@
+# Historical Builds
+
+The Pages publication workflow replaces this local placeholder with the retained build index.