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83bf7b2 | 1 2 3 4 5 6 | # Port movement scratch initialization and callback plans
RE-985. Focused validation: `cargo xtask test-group rust-client-move-scratch`. [Machine report](rust-client-move-scratch.json).
Rust owns an exact268-byte scratch slice and returns ordered zero/mode-callback plans. Twelve source/Rust fixtures compare every scratch word, guards and callback order. Invalid client slots reject before mutation; slice ownership prevents overwriting neighboring frame words. Callback execution and feedback are deliberately left to a future native adapter.
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