- Add $padding field to NativeFailedClonePressure class in failed-clone-finalizer.phpt
- Add $padding field to NativeFailedLifecyclePressure class in failed-lifecycle-escape.phpt
- Add $padding field to NativeFinalizerFiller class in finalizer-allocation.phpt
- Add $padding field to NativeFinalizerPressureObject class in finalizer-inheritance-exception.phpt
- Add multiple padding fields ($padding1, $padding2, $padding3) to NativeGcThresholdValue class in gc-threshold.phpt
- Add $padding field to NativeLifecycleFiller class in lifecycle-exceptions.phpt
- Update native heap memory layout documentation with fixed header size information
- Clarify that GC header uses two machine words (16 bytes on 64-bit platforms)
- Explain that object size, alignment and callbacks are stored in static NativeTypeDescriptor
- Remove mention of initial
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