feat(sites): typed terrain data and height field sampler

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

scripts/quality_gate.sh

@@ -103,6 +103,16 @@ check_godot_log \
 	"production sonar application unit tests" \
 	"$QUALITY_TEMP_DIRECTORY/sonar-application-unit-console.log"
 
+printf 'Quality gate: production site domain unit tests\n'
+"$GODOT_EXECUTABLE" --headless \
+	--log-file "$QUALITY_TEMP_DIRECTORY/site-domain-unit.log" \
+	--path . \
+	--script tests/unit/run_site_domain_tests.gd \
+	2>&1 | tee "$QUALITY_TEMP_DIRECTORY/site-domain-unit-console.log"
+check_godot_log \
+	"production site domain unit tests" \
+	"$QUALITY_TEMP_DIRECTORY/site-domain-unit-console.log"
+
 printf 'Quality gate: production foundation integration\n'
 "$GODOT_EXECUTABLE" --headless \
 	--log-file "$QUALITY_TEMP_DIRECTORY/foundation-integration.log" \