v0.6.0 — adapter parity
Adapter feature parity (#340/#356): dedicated vLLM + llama.cpp backends + selector, QoS-aware admission, availability scheduling, policy trio (TokenValidator, IdempotencyGuard opt-in, trust auditor), mesh gossip + /v1/peers (HMAC) + /v1/relay. register() stashes node token (BUG-5). 185 tests; local E2E verified.