Render the proxied Layer1Output (D-225) as toggleable Atlas overlays. The
viewer stores the decoded Layer1Output via set_generation_layer1() and the
marker overlay draws three new layers gated by their visibility flags:
RVR river_cells as dots, confluences as small circles, mouths as
double-ring sea-terminus markers
BAS drainage-basin boundaries as thin closed polylines + faint fill
ATR geographic attractors — shape by attractor_type (Araminta's 7-shape
vocabulary), color by sub_biome, size by strength; <0.15 culled
Layer-1 positions are [row, col] in the 512x256 working grid, which matches
the viewer's grid_to_canvas transform, so they project directly onto the
heightmap. OVERLAY_DEFS gains gen_l1_rivers/basins/attractors (toggle group)
so AtlasOverlayBar auto-exposes them as toggle buttons.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
jpmschweitzerandClaude Opus 4.7
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