diff --git a/AGENTS.md b/AGENTS.md
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@@ -0,0 +1,98 @@
+# OpenPencil
+
+Vue 3 + CanvasKit (Skia WASM) + Yoga WASM design editor. Tauri v2 desktop, also runs in browser.
+
+## Commands
+
+- `bun run check` — lint + typecheck (run before committing)
+- `bun run format` — oxfmt with import sorting
+- `bun test ./tests/engine` — unit tests
+- `bun run test` — Playwright visual regression
+- `bun run tauri dev` — desktop app with hot reload
+
+## Code conventions
+
+- `@/` import alias for cross-directory imports, `./` for same directory
+- No `any` — use proper types, generics, declaration merging
+- No `!` non-null assertions — use guards, `?.`, `??`
+- Shared types (GUID, Color, Vector, Matrix, Rect) live in `src/types.ts`
+- Window API extensions (showOpenFilePicker, queryLocalFonts) live in `src/global.d.ts`
+- Use `culori` for color conversions — don't reimplement parseColor/colorToRgba
+- Use `@vueuse/core` hooks (useEventListener, etc.) — don't do manual addEventListener/removeEventListener
+- `src/kiwi/kiwi-schema/` is vendored — don't modify
+
+## Rendering
+
+- Canvas is CanvasKit (Skia WASM) on a WebGL surface, not DOM
+- Rendering is coalesced via rAF — call `scheduleRender()`, not `renderNow()`
+- `renderNow()` is only for surface recreation and font loading (need immediate draw)
+- Resize observer uses rAF throttle, not debounce — debounce causes canvas skew (old WebGL surface stretched into resized element)
+- Viewport culling skips off-screen nodes; unclipped parents are NOT culled (children may extend beyond bounds)
+- Selection border width must be constant regardless of zoom — divide by scale
+- Section/frame title text never scales — render at fixed font size, ellipsize to fit
+- Rulers are rendered on the canvas (not DOM), with selection range badges that don't overlap tick numbers
+
+## Scene graph
+
+- Nodes live in flat `Map<string, SceneNode>`, tree via `parentIndex` references
+- Frames clip content by default is OFF (unlike what you'd assume)
+- When creating auto-layout, sort children by geometric position first
+- Dragging a child outside a frame should reparent it, not clip it
+- Layer panel tree must react to reparenting — watch for stale children refs
+- Groups: creating a group must preserve children's visual positions
+
+## Components & instances
+
+- Purple (#9747ff) for COMPONENT, COMPONENT_SET, INSTANCE — matches Figma
+- Instance children map to component children via `componentId` for 1:1 sync
+- Override key format: `"childId:propName"` in instance's `overrides` record
+- Editing a component must call `syncIfInsideComponent()` to propagate to instances
+- `SceneGraph.copyProp<K>()` typed helper — uses `structuredClone` for arrays
+
+## Layout
+
+- `computeAllLayouts()` must be called after demo creation and after opening .fig files
+- Yoga WASM handles flexbox; CSS Grid blocked on upstream (facebook/yoga#1893)
+- Auto-layout creation (Shift+A) must recompute layout immediately to update selection bounds
+
+## UI
+
+- Use reka-ui for UI components (Splitter, ContextMenu, DropdownMenu, etc.)
+- Tailwind 4 for styling — no inline CSS, no component-level `<style>` blocks
+- Mac keyboards: use `e.code` not `e.key` for shortcuts with modifiers (Option transforms characters)
+- Splitter resize handles need inner div with `pointer-events-none` for sizing (zero-width handle collapses without it)
+- Number input spinner hiding is global CSS in `app.css`, not per-component
+- ScrubInput (drag-to-change number) — cursor and pointerdown on outer container, not inner spans
+- Icons: use unplugin-icons with Iconify/Lucide (`<icon-lucide-*>`) — don't use raw SVG or Unicode symbols
+- Sections are draggable by title pill, not by the area to the right of the title
+
+## File format
+
+- .fig files use Kiwi binary codec — schema in `src/kiwi/codec.ts`
+- `NodeChange` is the central type for Kiwi encode/decode
+- Vector data uses reverse-engineered `vectorNetworkBlob` binary format — encoder/decoder in `src/engine/vector.ts`
+- showOpenFilePicker/showSaveFilePicker are File System Access API (Chrome/Edge), not Tauri-only — code has fallbacks
+- Tauri detection: `IS_TAURI` constant from `src/constants.ts` — don't use `'__TAURI_INTERNALS__' in window` inline
+- .fig export: compression with fflate (browser) or Tauri Rust commands
+- Test .fig round-trip by exporting and reimporting in Figma
+
+## Tauri
+
+- Tauri v2 with plugin-dialog, plugin-fs, plugin-opener
+- File system permissions must be configured in `desktop/tauri.conf.json` — "Internal error" on save means missing permissions
+- Dev tools: add a menu item to toggle, don't rely on keyboard shortcut
+
+## Reference
+
+[figma-use](https://github.com/dannote/figma-use) — our Figma toolkit. Use as reference for:
+- Kiwi binary format, schema, encode/decode (`packages/shared/src/kiwi/`)
+- Figma WebSocket multiplayer protocol (`packages/plugin/src/ws/`)
+- Vector network blob format (`packages/shared/src/vector/`)
+- Node types, paints, effects, layout fields (`packages/shared/src/types/`)
+- MCP tools / design operations (`packages/mcp/`)
+- JSX-to-design renderer (`packages/render/`)
+- Design linter rules (`packages/linter/`)
+
+## Known issues
+
+- Safari ew-resize/col-resize/ns-resize cursor bug (WebKit #303845) — fixed in Safari 26.3 Beta
diff --git a/PLAN.md b/PLAN.md
index 9c1e998ff..9b4e15172 100644
--- a/PLAN.md
+++ b/PLAN.md
@@ -1139,7 +1139,10 @@ bun run test:figma:report
 
 Based on our research, **Yoga** is the right choice now:
 
-- **CSS Grid support is landing** — 9-part PR series active (Feb 2026)
+- **CSS Grid support is landing** — [facebook/yoga#1893](https://github.com/facebook/yoga/pull/1893)–#1902 (9 PRs by @intergalacticspacehighway from Expo)
+  - PR 1/9 (style types & public API) under active review by NickGerleman (Meta), last activity Feb 28, 2026
+  - Supported: `grid-template-columns/rows`, `grid-column/row-start/end`, `grid-auto-columns/rows`, `minmax()`, `auto`, `%`, `px`, `fr`
+  - Not yet: `repeat()`, `auto-fill`/`auto-fit`, `grid-template-areas`, `grid-auto-flow`, subgrid
 - Battle-tested in React Native (billions of devices)
 - ~45KB WASM, well-maintained by Meta
 - Flexbox + Grid covers everything a design tool needs
@@ -1431,6 +1434,51 @@ This PoC validates the entire stack end-to-end in 4 weeks, before committing to
 
 ---
 
+## CLI & Headless Mode
+
+The editor should be fully controllable by AI agents and usable in CI without a GUI.
+
+### Two modes
+
+**Attached** — CLI connects to a running OpenPencil instance via WebSocket. The app starts a WS server on a configurable port. `eval` runs JS in the app's context with full access to the editor store, scene graph, renderer, and CanvasKit. This is how interactive AI workflows work (create, modify, screenshot, iterate).
+
+**Headless** — CLI loads the engine directly in Bun/Node, no window, no Tauri, no WebGL. The engine (scene-graph, layout, codec) is pure TypeScript with no DOM dependencies. Rust zstd/zip is replaced with fflate (already bundled as browser fallback). This enables linting, analysis, .fig validation, and CI pipelines without a running app.
+
+### Package structure
+
+```
+packages/
+  core/        — scene-graph, layout, codec, types (extracted from src/engine/)
+  cli/         — open-pencil CLI (eval, lint, find, export, etc.)
+  mcp/         — MCP server (wraps CLI commands for AI agents)
+```
+
+`core` is the key extraction: the engine without rendering, importable by CLI, MCP, tests, and the app. The app's `src/engine/` imports from `core` instead of owning the types.
+
+### CLI commands (matching figma-use where applicable)
+
+| Command | Mode | Description |
+|---------|------|-------------|
+| `eval <code>` | attached | Run JS in editor context |
+| `find <query>` | both | Find nodes by name, type, XPath |
+| `lint` | both | Run design linter rules on .fig/.openpencil file |
+| `export <format>` | attached | Export selection/page as PNG/SVG/PDF |
+| `node get <id>` | both | Get node properties |
+| `node tree` | both | Print node tree |
+| `create <type>` | attached | Create a node |
+| `set <prop> <value>` | attached | Set node property |
+| `analyze colors` | both | Analyze color palette |
+| `analyze spacing` | both | Analyze spacing consistency |
+| `mcp` | both | Start MCP server |
+| `open <file>` | attached | Open .fig/.openpencil file |
+| `screenshot` | attached | Capture current viewport |
+
+### Why not a Tauri CLI?
+
+Tauri is a GUI framework — no headless mode. A separate Bun-based CLI that imports `core` directly is simpler, faster to start, and works in CI (Docker, GitHub Actions) without X11/Wayland.
+
+---
+
 ## Keyboard Shortcuts Reference
 
 Full Figma-compatible shortcut map. Implemented shortcuts marked with ✅.
diff --git a/README.md b/README.md
index 741bcf3ae..cd2c757e7 100644
--- a/README.md
+++ b/README.md
@@ -4,17 +4,21 @@ Open-source, AI-native design editor. Figma alternative built from scratch with
 
 > **Status:** Active development. Not ready for production use.
 
+![OpenPencil](screenshot.png)
+
 ## Features
 
 - **Figma .fig file import** — open native Figma files directly
 - **Figma clipboard** — copy/paste between OpenPencil and Figma
 - **Vector networks** — complex boolean shapes and open paths, like Figma
 - **Auto-layout** — constraint-based layout matching Figma behavior
+- **Components & instances** — with live sync, overrides, component sets
 - **Pen tool** — bezier curves with tangent handles
-- **Inline text editing** — multi-line text with Inter font
+- **Inline text editing** — multi-line text with system fonts
 - **Undo/redo** — all operations are undoable
 - **Snap guides** — edge and center snapping
-- **Color picker** — HSV, hue/alpha sliders, hex input
+- **Color picker** — HSV, hue/alpha sliders, hex input, gradients
+- **~5 MB install, works fully offline** — no account, no server, no internet required
 
 ## Tech Stack
 
diff --git a/desktop/tauri.conf.json b/desktop/tauri.conf.json
index 5536c28e5..385ad6388 100644
--- a/desktop/tauri.conf.json
+++ b/desktop/tauri.conf.json
@@ -2,7 +2,7 @@
   "$schema": "https://schema.tauri.app/config/2",
   "productName": "open-pencil-app",
   "version": "0.1.0",
-  "identifier": "com.dannote.open-pencil-app",
+  "identifier": "net.dannote.open-pencil",
   "build": {
     "beforeDevCommand": "bun run dev",
     "devUrl": "http://localhost:1420",
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