# Port fixed-pool allocation and terminal-state semantics

RE-1041. Focused validation: `cargo xtask test-group rust-location-allocation`. [Machine report](rust-location-allocation.json).

Rust matches16 actual allocator cases, including recent-free retry, count extension/registration, signed time gates and partial initialization. Terminal diagnostic/fatal outcomes preserve the source count and scan state, including count1025 before fatal handling. The supplied pool retains unrelated words. Unit tests cover retry without zeroing, terminal count behavior and rejection of subsequent allocation from invalid terminal count. Native registration/fatal handling remain plans/boundaries.