Hakozuna HZ5: A Page/Run-First Sidecar Allocator Prototype

This release contains the Hakozuna HZ5 sidecar allocator prototype source, English/Japanese paper PDFs, design notes, and benchmark/reproducibility artifacts.

HZ5 explores a page/run-first allocator design alongside the existing HZ3 and HZ4 profiles. It focuses on low-RSS behavior, fail-closed ownership, descriptor-owned front-ends, page-oriented remote-free handling, and profile-specific Linux allocator lanes.

Main components include:

- hakozuna-hz5/: HZ5 sidecar allocator source
- api/: public HZ5 allocator API
- contract/: SpeedLane descriptor ABI and purity contract
- policy/: HZ5-native allocation/free dispatch policy
- lowpage/, midpagefront/, and largefront/: experimental page/run front-ends
- Linux benchmark scripts and profile matrices
- English and Japanese paper PDFs

The benchmark results should be read as workload- and platform-specific evidence rather than a universal allocator ranking.

Code repository: https://github.com/hakorune/hakozuna

This HZ5 record is separate from the HZ3/HZ4 ACE-Alloc artifact series and is intended as an experimental sidecar allocator prototype release.