0.01 2026-04-10
    - Initial release
    - Str variant: mutex-protected request queue with circular arena
    - Int variant: lock-free Vyukov MPMC request queue
    - Per-slot futex for targeted response delivery
    - Generation counter for ABA-safe cancel/recycle
    - PID-based stale lock and slot recovery
    - Dual eventfd for async EV integration
    - File-backed, anonymous, and memfd shared memory