M0: workspace skeleton — geom, color, doc, render, text, pathops, svg, tools, engine

Engine-first Cargo workspace for DrawCraft (clean-room Illustrator):
- geom: anchor-based path model, shapes, hit testing, snapping
- color: colours, paints, gradients, swatches, blend modes, harmonies
- doc: persistent Arc document tree, appearance stacks, text model, selection
- render: vello_cpu renderer (appearance, gradients, clip groups, blend modes)
- text: font DB, harfrust shaping, point/area/path layout
- pathops: curve booleans (linesweeper), Pathfinder, offset, simplify
- svg: import (usvg) and export
- tools: selection/direct/pen/shape tools emitting commands
- engine: Session, history with interactions, ~110 commands

Co-Authored-By: Claude Opus 5.5 <[email protected]>

crates/testkit/Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "drawcraft-testkit"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+description = "DrawCraft test helpers"
+
+[lints]
+workspace = true
+
+[dependencies]
+drawcraft-geom = { workspace = true }
+drawcraft-doc = { workspace = true }

crates/testkit/src/lib.rs

@@ -0,0 +1,2 @@
+//! DrawCraft test helpers
+#![forbid(unsafe_code)]