feat: P.0.lib.render colored-quad tile-grid renderer

README.md

@@ -0,0 +1,30 @@
+# lib-core.render
+
+P.0 colored-quad tile-grid renderer. Reads `lib-core.maps`'s current map +
+its tilemap, iterates tiles, draws a colored rect per tile via
+`engine.render.draw_rect`. Fallback to magenta `[255, 0, 255]` for tiles
+with missing/malformed color.
+
+- Lib-ID: `lib-core.render`
+- Version: `0.1.0`
+- Spec: `meta/docs/superpowers/specs/2026-05-09-p0-lib-render-design.md`
+
+Forward-compat stubs (DEPRECATED-MVP) for texture-rendering,
+PROTOTYPE-Lib-Pattern, camera, layers, post-processing, parallax,
+shaders, hot-reload. See `meta/docs/architecture/render-pipeline.md`
+for the full target spec (941 lines).
+
+## API
+- `r_lib.draw_map(map_id?)` — iterates current (or specified) map's tiles,
+  draws colored rect per tile. Must be called inside a render hook.
+  Returns count of tiles drawn.
+
+## Consumer pattern
+```lua
+local maps  = require("lib-core.maps")
+local r_lib = require("lib-core.render")
+function render(ctx)
+    engine.render.clear_color(engine.render.rgb(20, 20, 30))
+    r_lib.draw_map()
+end
+```