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f8069c0624
perf annotate put 94% of VertexArrayState::Bind's 10.5% self time on the two lock-prefixed shared_ptr refcount RMWs each bind performs. The bound VAO is now stored as a slot index into m_vertexArrays - no SharedPtr copy, no atomics on the bind path. The lifetime invariant (the bound object is kept alive by its slot; any cold path that clobbers a bound slot - delete-while-bound including slot 0, create-over-bound-slot - detaches the old object into m_boundDetached so GetBoundVertexArray keeps answering with it) is enforced in MarkVertexArrayForDeletion / CreateVertexArrayObject rather than assumed, and documented at the change. Out-of-range binds and null slots keep their exact old semantics. VertexArrayObject also gains two opaque config-version-guarded backend aux memo words, letting a backend answer "same vertex-input layout?" from the frontend object instead of chasing its own cold cache entry. After this change the frontend Bind drops out of the DirectVulkan draw profile entirely (11.5% -> 0.5%). Measured jointly with the two backend rounds that land on top: quiet-box 6-round order-alternating A/B, all nine cases, no case worse than noise on either backend. Unit tests 421/421.