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The left relative slingshot probe proved the spin projection, but its geometry did not distinguish the sign rule. A stopped-Wine probe on symmetric record 72 did: the binary uses the standard dot-product tangent for both spin and the opposing direction of the current tangential response. The earlier swapped-component interpretation happened to agree for vertical walls and a centered circle but selected the wrong sign on the right slingshot. Use `tv=(vx*nx+vy*ny)/length`, update spin with `tv*0.02*response_tangent`, and apply `-sign(tv)*abs(normal_velocity)*response_tangent`, retaining the binary's negative direction when tv is zero. Seal record 72's exact position, velocity, and `+5.46` Real48 spin in C and Rust. Keep the two-minute autoplay assertion focused on actual launch, press/release, target, bumper, and finite-state activity after the corrected trajectory. Test Plan: - stopped Wine 11.15 record-72 injection/trace -- matched position, velocity, and spin - `cargo test --workspace --all-targets --all-features` -- 124 passed - `cargo clippy --workspace --all-targets --all-features -- -D warnings` -- passed - `bash original/tools/test_reconstructed_c.sh` -- passed - `python3 original/tools/audit_reconstruction.py --require-complete` -- passed with zero incomplete or unclassified units - `rumdl check --flavor commonmark RECONSTRUCTION.md CHANGELOG.md` -- passed - `git diff --cached --check` -- passed