- heightmap.rs: read sea_level from the PNG tEXt chunk (bake writes it), default-fallback param; new test reads_sea_level_from_text_chunk. - client atlas_viewer.gd: load reliefmap.png (color display) instead of heightmap.png (now 16-bit grayscale elevation, cascade-only). - drop atlas_body_heightmaps: removed from systems-schema.sql; DROP TABLE in import_economics MIGRATION_SQL (the PNG is the store now). - D-202 amendment: implementation-status note (consumer + producer done), resolving the review's 'reads done but producer pending' point. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>