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Sibling crate using egui/eframe. Click empty space to drop a node and start a road from it; click a second node to close the road. Drag a node to live-apply MoveNode (with snap-back on rejection). Side panel exposes every SubdivisionParams knob, view toggles, and timing stats. - Workspace Cargo.toml at repo root. - RoadGraph::nodes() iterator added (needed to hit-test isolated just-placed nodes that have no incident road yet). - WASM target list is configured in Cargo.toml but native is the only shipped frontend in this commit — WASM bundling lands next. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>