[Feature/Kernel] Implement Asynchronous eBPF sockmap Garbage Collector to Prevent Stale Connection Memory Leaks

Commercial Production Objective

Prevent kernel-space memory exhaustion anomalies and orphan memory slot leakage during rapid multi-tenant connection cycling under intense AI agent workflows .

Bare-Metal Technical Specifications

1. Orphan Socket Intercept: Implement an asynchronous driver loop hooked into the kernel's tcp_done transition path to track dead or terminated file descriptors.
2. Atomic Map Eviction: Programmatically issue atomic eviction signals to purge matching indices from the central BPF_MAP_TYPE_SOCKMAP memory tables inside <500 microseconds flat .
3. Zero-Lock Cleaning Core: Eliminate kernel thread synchronization locks during map sweeping windows, maintaining flawless line-rate volumetric transit .

No files, tests, or entry points are named. Start by locating the sockmap implementation and the tcp_done integration point, then determine how terminated descriptors and BPF_MAP_TYPE_SOCKMAP entries are currently handled. Done requires asynchronous cleanup, atomic matching-entry eviction under 500 microseconds, and no synchronization locks during sweeping.