Lo Shu Grid

Builds a Lo Shu 3x3 numerology grid from a birth date. Returns the grid with digit counts, present/missing/repeated numbers, plane analysis over the eight lines of the square (rows mental/emotional/practical, columns thought/will/action, two diagonals), and per-number trait interpretation. In number_analysis, plane is the legacy v1 grouping (1-3 mental, 4-6 physical, 7-9 spiritual) and lo_shu_plane is the number's row of the square (mental 4-9-2, emotional 3-5-7, practical 8-1-6).