Rust exit-rule class guard with bounded configured scanning

RE-827. Reproduce with python3 scripts/analyze_rust_exit_class.py; focused validation: cargo xtask test-group rust-exit-class. Machine report.

45 source fixtures verify exact offender selection, raw signed class behavior and mode/state/team gates. Unit tests cover64-slot ordering, truncation and invalid safe-slice bounds. The API returns an offender intention without formatting, sending or transition effects.

Original executable/native runtime and complete Linux/macOS Rust/Bevy/Solari acceptance remain unverified.