Describe the vector art tab (#129, stage 3)

- Architecture names src/editor/vectorart with VectorArtEditor and
  VectorArtCanvas, and says that polygonEdit now also carries the
  rings of a vector art shape, whose points may have Bezier handles.
- Development carries the check sum 1172, measured in a full run.

Architecture.md

@@ -123,7 +123,10 @@ src/editor/            App → Editor (layout + ticker), PlaySession (the run),
                        EditorRun (run in editor), state, actions, shortcuts, debugHook,
                        textProbe (finding widgets by their text — the ground floor of the test hook, shared with the sign-in screen),
                        auth/LoginScreen + auth/PasswordDialog + auth/loginRules + auth/FormStatus (the sign-in screen and the change-password dialog in the canvas, what either may complain about, and the warning line and busy state both show, #177/#182), autosave,
-                       polygonEdit (corners of an outline: what is under the pointer, whether a point is inside, put / move / take away — scene view and Texture tab),
+                       polygonEdit (points of an outline: what is under the pointer, whether a point is inside,
+                       put / move / take away — scene view and Texture tab; and the same for a ring of a vector art
+                       shape, where a point may carry Bezier handles: `ringGripAt`, splitting a curved segment
+                       without changing the curve, making a corner round, #129),
                        fileImport (drop/paste) → assetImport (one upload pipeline, an ImportKind per sort) ← textureImport / fontImport / soundImport,
                        FilePicker (the shared "+ → Texture / Font / Sound" dialog; ImagePicker/FontPicker/SoundPicker only describe their row),
                        framing (fit/marquee/snap maths), FormDialog (the small modal forms: label column, Cancel + confirm, one open at a time; `dialogButtons` is the closing row every dialog shares, the pickers' included), AssetTabEditor (the shared shell of the asset tabs), TabHeader (the bar across the top of a tab — asset tabs, Plugins tab, NodeBoard; drawn by `drawHeaderBar` like the toolbar and the breadcrumb),
@@ -156,6 +159,9 @@ src/editor/graph/      GraphEditor (header, breadcrumb), GraphCanvas, graphView
 src/editor/container/  ContainerEditor (header), ContainerCanvas (a SceneViewport on a template)
 src/editor/texture/    TextureEditor (header), TextureCanvas (picture + frames), SliceDialog (a FormDialog), sheetView (the grid maths),
                        ImagePicker + imageGrid (the "+ → Texture" dialog), checker (the transparency board)
+src/editor/vectorart/  VectorArtEditor (header: the two tools and the grid switch), VectorArtCanvas (the drawing
+                       painted from core/model/vectorPath onto its own Graphics, with points and handles over it;
+                       the pen puts points down, the arrow drags points, handles and whole shapes, #129)
 src/editor/animation/  AnimationEditor (header, preview over timeline), PreviewCanvas (the root at the playhead, a FreeViewport
                        over animationPreview.ts), TimelineCanvas (rows, keys, ruler, clipboard), timelineView (its geometry),
                        RowDialog + FramesDialog (FormDialogs)

Development.md

@@ -13,7 +13,7 @@ npm run check        # typecheck + lint + format:check + tests, the gate CI runs
 npm run build        # writes dist/ and regenerates index.html
 ./build.sh           # the same under `set -o pipefail`, for callers that pipe the output
 php tools/make-user.php <name> <password>                     # an account; every tool signs in (see Accounts)
-node tools/seed-e2e.mjs && node tools/e2e.mjs                 # 1165 editor checks, screenshots in /tmp/gm-e2e-*.png
+node tools/seed-e2e.mjs && node tools/e2e.mjs                 # 1172 editor checks, screenshots in /tmp/gm-e2e-*.png
 GM_STEPS=20 node tools/e2e.mjs                                # or 1-12, or 6,20 — a subset while working on one step
 ./e2e.sh start [GM_STEPS]                                     # the same run detached, see below
 ./e2e.sh status                                               # live progress, or the last run's result