▣ wi

Sub-item of #1006 PLUTO-89 fast-follow hardening: multi-pieza dup-guard is order-sensitive ('11,12' vs '12,11' evades tier-1 because piezas keep insertion order). Canonicalize the pieza set for the dedup KEY only (sorted), preserving as-entered display/storage order. Needs functional index or normalized key column · pluto