[MEMORY-CORE] Optimization: Eradicate Atomic CAS Instruction Thrashing and False Sharing on Ring Tail Array Pointer Slots

Architectural Bottleneck

High-concurrency systems trace profiling reveals massive CPU execution degradation and severe microsecond tail latency spikes (P99 outliers) across our circular pointer buffer layers (internal/storage/ring_buffer.go).

Root Cause Analysis

The internal atomic pointers tracking the head and tail state indexes share the identical L1/L2 hardware processor cache line. High-frequency parallel processing threads trigger constant cache invalidation switches (False Sharing).

Proposed Fix

Introduce explicit architecture-level struct alignment padding variables (struct { PaddingByte }) to separate index counters across discrete 64-byte boundaries, dropping hardware memory contention allocation overhead to absolute 0%.

Start by reading internal/storage/ring_buffer.go and tracing how the head and tail state indexes are represented and accessed under concurrent load. Use the profiling evidence described in the issue to confirm the contention, then verify that the completed change separates the pointer slots and improves the reported cache invalidation and tail-latency behavior.