test: require explicit unsafe test value type

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

test-support/unsafe-test-value.ts

@@ -1,5 +1,5 @@
 export function unsafeTestValue<TValue extends PropertyKey>(value: TValue): TValue
-export function unsafeTestValue<TValue = any>(value: unknown): TValue
-export function unsafeTestValue<TValue = any>(value: unknown): TValue {
+export function unsafeTestValue<TValue>(value: unknown): TValue
+export function unsafeTestValue<TValue>(value: unknown): TValue {
   return value as TValue
 }