Expand wildcard imports (AvoidStarImport, 79 violations)

[sspaink]

AvoidStarImport flags import x.y.*. 79 instances across 52 files.

Top offenders

• opa-builtins-token/.../TokenBuiltins.java — 5
• opa-evaluator/.../ir/Evaluator.java — 4
• opa-evaluator/src/test/.../ir/PolicyTest.java — 4
• opa-evaluator/.../ast/builtin/impls/ArithmeticBuiltins.java — 3 (incl. java.lang.Math.*)
• many test files using Assertions.* and Mockito.*

Decision needed

Tests using Assertions.* and Mockito.* static-imports are idiomatic JUnit/Mockito style. Two reasonable resolutions:

1. Expand them all (mechanical IDE fix).
2. Add an exception for org.junit.jupiter.api.Assertions and org.mockito.Mockito via <property name="excludes" value="..."/> on AvoidStarImport.

My lean: (2) for those two specific imports (matches community style), (1) for everything else.