Explain a validated tropical Western natal chart as traceable symbolic structure using exact placement, house, angle, retrograde, major-aspect, and available unscored traditional-condition facts. Use for 本命盘解读、行星落座说明、宫位主题、相位结构 after `$western-natal`. Do not invent dignity scores, modern outer-planet rulerships, Placidus, event prediction, identity diagnosis, or high-impact advice.
