fix: add missing @TemporalDsl receiver annotation to setRetryOptions extensions

[vikas0686]

Problem

Three setRetryOptions extension functions were missing @TemporalDsl on the receiver type:

// Before (missing annotation on receiver)
inline fun ActivityOptions.Builder.setRetryOptions(
  retryOptions: @TemporalDsl RetryOptions.Builder.() -> Unit
)

LocalActivityOptionsExt already had the correct pattern:

// Correct (receiver is annotated)
inline fun @TemporalDsl LocalActivityOptions.Builder.setRetryOptions(
  retryOptions: @TemporalDsl RetryOptions.Builder.() -> Unit
)

Without @TemporalDsl on the receiver, Kotlin's @DslMarker mechanism cannot enforce scope isolation. Inside a setRetryOptions { } block, the outer ActivityOptions.Builder (or ChildWorkflowOptions.Builder / WorkflowOptions.Builder) remains an implicit receiver, so callers can accidentally invoke outer-scope builder methods inside the nested lambda — exactly the problem @TemporalDsl is designed to prevent.

Fix

Added @TemporalDsl to the receiver of setRetryOptions in:

• activity/ActivityOptionsExt.kt
• workflow/ChildWorkflowOptionsExt.kt
• client/WorkflowOptionsExt.kt

Tests

Added a standalone test in each of the three corresponding test classes that calls setRetryOptions directly on a builder instance (rather than only through the outer DSL), covering the extension function in isolation.

Notes

This is a compile-time correctness fix — r Existing code that uses ```
setRetryOptions {
}

Thanks for review and feedback