nx_nxa_anim_gate.nx

nx_nxa_anim_gate.nx -- GATE for the one NXA clip evaluator (nx_nxa_anim_lib), driven IN-PROCESS on PLANTED keys whose answers are known by arithmetic: lane sign-extension, track indexing that skips legacy channels and refuses a truncated section by name, the bracketing-key nlerp at a known midpoint, the shortest-path flip on a pair whose unflipped blend has the opposite sign, the root rule, the linear drift fit, the walk cadence default, drift-removed rows that read zero on the root, an untracked joint's identity rows, and a full idle hold that reproduces the pose. Every fixture asserts its own condition before its outcome. license_tier: ORIGINAL No hw writes (Rule 26).