nx_js_shape_gate.nx

nx_js_shape_gate.nx -- P3 SHAPES / hidden classes: prove (A) shape-keyed ICs give IDENTICAL results to the legacy per-object ICs and the tree-walker, and (B) they MEASURABLY win where per-object ICs fail -- a loop over MANY distinct objects of the SAME shape. Per-object ICs miss on every object (different pointers) and fall back to the linear obj_find scan; shape ICs hit across all of them. The signature: reading a LATE property (index ~9) across many objects costs ~the same as reading an EARLY property under shapes (O(1)), but scales with scan depth under per-object ICs. expect_exit: 0 license_tier: ORIGINAL