Upgrade request analysis routing

docs/kb/modules/tile-canvas-tools.md

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+# Tile Canvas Tools
+
+## What This Module Covers
+
+This module is about painting and editing the live map grid, not editing the source art for tiles or sprites.
+
+## Existing Capabilities
+
+- freehand paint on the active layer
+- rectangle, circle, and line-based placement workflows
+- erasing on active layers
+- height-aware sparse paint behavior
+- background tile and background-hole modes
+- grid-backed placement within chunk data