poly-kv 0.1.0-alpha.3

Shared compressed KV-cache pool for multi-agent context. Two-tier codec policy (fib-quant cold + turbo-quant hot) with typed receipts.
Documentation
# PHASE 09 — Docs, claim boundary, final audit

Tasks:

1. Update docs for z.py modes, policy, ecosystem parity, verification, and safety gates.
2. Document non-goals: no publishing, no signing by default, no full DLP, no registry superiority claims.
3. Produce final package.
4. Verify package from a copied location.
5. Produce hostile-auditor handoff.

Final report must include:

- changed files;
- commands run;
- pass/fail/skip table;
- package hash and content manifest hash;
- ecosystem adapters implemented/deferred;
- remaining risks;
- rollback path.