Confirm time (when) specs are re-enabled and document existing fix reference

[Copilot]

The issue tracked re-enabling tests/time specs that were previously class-level disabled pending Spine Time migration to the new Placeholder API. This PR confirms the tests are already enabled in-repo and points to the existing change that addressed it.

• Current state verification

  • TimestampWhenSpec and TemporalWhenSpec no longer have class-level @Disabled.
  • No code edits were required in this branch.

• Existing fix linkage

  • The removal of class-level @Disabled was already introduced by commit e427bb65 (Enable tests back), included via PR Suppress Java codegen warnings via Gradle DSL; fix duplicate and false-positive warnings #309.

• Relevant code state (already present)

  @DisplayName("If used with Protobuf `Timestamp`, `(when)` constraint should")
  internal class TimestampWhenSpec { ... }
  
  @DisplayName("If used with `Temporal`, `(when)` constraint should")
  internal class TemporalWhenSpec { ... }

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