RFC-0022: Memory and Concurrency Semantics

Status: Normative. Runtime alone owns authoritative storage. ReadView permits concurrent reads; WriteView is exclusive for its declared component/entity slice. Scheduler-declared dependencies establish happens-before; undeclared conflicts fail validation. Atomics are Relaxed/Acquire/Release/AcqRel/SeqCst only. Normal writes become authoritative only at RFC-0023 Commit. CPU/GPU transitions require explicit fence plus ownership transfer. Plugin/backend calls MUST declare accesses and cannot hide a data race. A view expires at transaction end; use after expiry is PWE_E_HANDLE_STALE.