Merge pull request #107 from bernardladenthin/claude/modest-fermi-x2nurn

docs: add Spotless formatting policy to CLAUDE.md

Author: bernardladenthin

CLAUDE.md

@@ -96,6 +96,11 @@ See [`../workspace/policies/javadoc-conventions.md`](../workspace/policies/javad
 
 See [`../workspace/policies/spotbugs-suppressions.md`](../workspace/policies/spotbugs-suppressions.md).
 
+## Spotless Formatting
+
+See [`../workspace/policies/spotless-formatting.md`](../workspace/policies/spotless-formatting.md).
+Run `mvn spotless:apply` before every commit that touches `.java` files.
+
 ## jqwik Policy
 
 See [`../workspace/policies/jqwik-prompt-injection.md`](../workspace/policies/jqwik-prompt-injection.md).