By: ValentinHirschi <valentin.hirschi@gmail.com>
share prepared cut kinematics with conditional sampling Conditional maps and physical LU evaluation now share an authenticated native ray and root. Each generating row freezes its selected source records before inverse-density work; only identical plans and represented prerequisites reuse a preparation. Precision attempts rebuild native records from the original source, while debug/norm/canonical work keeps separate root histories. Validate the selected graph, channel, parent and host definition before physical adoption. Directed checks bound represented root, first-derivative and radial volume agreement, including rotated probes. Keep raised eta jets on the retained ray and count adoption validation as sampling overhead. Remove obsolete wrapper precision casts. No saved-state layout changes. Validation: 184 unique core tests, including the full generated amplitude acceptance test, actual conditional/raised physics, affine roundoff, native replay, successful physical rotation and invalid-host rejection; three API regressions; cargo fmt/check/clippy and diff checks. Clippy has no new warnings. GL638 joint binding, stronger pointwise density alignment and the warmed 10% sampling-cost measurement remain follow-up work in ADVANCED_SAMPLING_PLAN.md. User request: (continue as planned but make sure the time spent in the sampling maps is still quite significantly less than the actual GL638 all-orientation integrand, i.e. it's not crucial to optimize the runtime of the sampling, except if it is somehow comparable to the integrand time; it should be like 10% at the very most, once below that then no need to optimize further).