0.03  2026-04-26
    - arena underflow guard; init under flock
    - strict fd validation; harden DESTROY
    - hoist SV construction out of recv multi/drain mutex
    - class prefix on client croaks
    - eventfd consume returns count; MAKE OBJ macro fix
    - idempotent eventfd; aarch64 CI matrix


0.02  2026-04-12
    - Add SEE ALSO cross-links to family modules

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
