diff --git a/README.md b/README.md
index 3970942..998c60e 100644
--- a/README.md
+++ b/README.md
@@ -1,21 +1,27 @@
 # USD Layer Manager
 
-A C++17 / Windows desktop application providing a **Maya Render Layers-style** USD scene editor using **OpenUSD v25.05**, **ImGui 1.92.7** (docking branch), and **OpenGL 3.3** (via GLAD). Users can open, edit, and save USD files, manage layered stage overrides, inspect and edit prim properties, and interact with 3D scenes through a Hydra viewport.
+A C++17 / Windows desktop application providing a **Maya-style** USD scene and look-dev editor using **OpenUSD v25.05**, **ImGui 1.92.7** (docking branch), and **OpenGL 3.3** (via GLAD). Users can open, edit, and save USD files, manage layered stage overrides, inspect and edit prim properties, author UsdShade material graphs with a live shader-ball preview, animate with a Bezier curve editor, and interact with 3D scenes through a multi-viewport Hydra renderer with OCIO color management.
 
 ![Screenshot](docs/icons/screenshot_01.png)
 
 ## Features
 
-- **Layer Stack Management** — Create, reorder, mute/unmute sublayers with full undo support
-- **Scene Hierarchy** — Browse prim tree with per-type SVG icons; create, delete, rename prims; add/replace references
+- **Layer Stack Management** — `StageEditorPanel`: create, reorder, mute/unmute sublayers, set the edit target, add existing files as sublayers, with full undo support
+- **Scene Hierarchy** — Browse prim tree with per-type SVG icons; create, delete, rename, reparent, and group prims; add/replace references
 - **Property Editor** — Maya Channel Box-style attribute editing with type-aware drag inputs, color pickers, and undoable transforms
-- **3D Viewport** — Hydra rendering via `UsdImagingGLEngine` into an offscreen FBO; switchable render delegates (Storm, Embree, Arnold, Cycles); grid overlay; selection bounding boxes; camera wireframes
-- **Multi-Viewport** — Single, horizontal split, vertical split, and quad layouts; per-tile camera and render settings; Space to maximize/restore
+- **Material Editor** — Hypershade-style node-graph editor for UsdShade/MaterialX networks (`MaterialEditorPanel`): material browser, drag-to-connect node canvas, per-node/per-pin display modes, Sdr-driven node creation menu and enum dropdowns, colorSpace authoring on texture inputs, and a live shader-ball preview (`MaterialPreviewRenderer`) with its own renderer/HDRI/preview-shape controls. In-canvas node thumbnails (`NodeThumbnailCache`) show texture previews and per-node shader-ball renders, amortized across frames and re-rendered until progressive delegates (Arnold/Cycles/Embree) fully converge
+- **Timeline & Curve Editor** — Transport controls with loop/bounce and Auto-Key (`TimelinePanel`); a Maya-style F-curve editor (`CurveEditorPanel`) with Bezier round-trip to USD time samples; Playblast export to MP4 via `MovieEncoder` (libavcodec)
+- **3D Viewport** — Hydra rendering via `UsdImagingGLEngine` into an offscreen FBO; switchable render delegates (Storm, Embree, Arnold, Cycles); OCIO-based color management (sRGB or full display/view/look pipeline) applied as a post-Hydra GL pass; grid overlay; selection bounding boxes; camera/light wireframes
+- **Multi-Viewport** — Single, horizontal split, vertical split, and quad layouts; per-tile camera, render delegate, and AOV; Space to maximize/restore
 - **Camera Control** — Free orbital camera (tumble/truck/dolly) or drive from USD camera prims; auto near/far clipping; frame selection; correct camera prim orientation for Y-up and Z-up stages
 - **Transform Gizmo** — Pure ImDrawList-based manipulator (translate/rotate/scale) in object or world space
-- **Undo/Redo** — Full command history for prim creation/deletion, attribute edits, transform changes, and layer operations; Ctrl+Z / Ctrl+Y hotkeys; Edit menu integration
+- **Undo/Redo** — Full command history (`ICommand` subclasses under `src/core/commands/`) covering prim creation/deletion/reparenting/grouping, attribute edits, transform changes, shader-node creation/connection, and layer operations; Ctrl+Z / Ctrl+Y hotkeys; Edit menu integration
 - **Multi-select** — Rectangular selection in viewport with cross-panel syncing
 
+| Material Editor (Arnold) | Curve Editor | Quad Viewport (4 delegates) | MaterialX import |
+|---|---|---|---|
+| ![Material Editor](docs/icons/screenshot_06.png) | ![Curve Editor](docs/icons/screenshot_02.png) | ![Quad Viewport](docs/icons/screenshot_03.png) | ![MaterialX](docs/icons/screenshot_04.png) |
+
 ## Dependencies
 
 | Dependency | Version | Notes |
@@ -53,7 +59,7 @@ cmake --install build --config Release
 
 The installed executable lives in `install/bin/`.
 
-**Presets** — `default` (Release + tests), `debug`, `release`, `no-tests`.
+**Presets** — `default` (`Release`, `WITH_CYCLES=ON`, all render delegates), `debug` (`Debug`), `release` (`RelWithDebInfo`, installs), `no-tests` (`Release`). All presets currently build with `BUILD_TESTS=OFF`.
 
 ### Building with Cycles
 
@@ -63,10 +69,7 @@ Cycles runtime dependencies (`embree4.dll`, `openvdb.dll`, `OpenImageDenoise.dll
 
 ### Tests
 
-```powershell
-cmake --build build --config Release
-ctest --test-dir build -C Release
-```
+There is currently no working test runner: `BUILD_TESTS` is `OFF` in every preset. The two test executables (`ViewportDisplayTest`, `RendererDiagnosticTest`) have stale USD include paths and don't build — fix those before turning `BUILD_TESTS` on.
 
 ## Architecture
 
@@ -77,31 +80,46 @@ src/
 │   ├── UsdStageManager       — Stage open/create/save/close lifecycle
 │   ├── LayerManager          — Layer stack introspection and mutation
 │   ├── PropertyManager       — Property read/write via edit target with undo
+│   ├── MaterialManager       — UsdShade graph introspection + Sdr node-type/enum discovery
 │   ├── CommandHistory        — Undo/redo stack for ICommand instances
-│   ├── UsdSceneRenderer      — Hydra rendering + picking + overlays
+│   ├── UsdSceneRenderer      — Hydra rendering + picking + overlays + OCIO color correction
 │   ├── ViewportCamera        — Free / USD-camera-driven orbital camera
 │   └── commands/             — ICommand subclasses for all mutable operations
-│       ├── TransformCommand      — Undoable translate/rotate/scale
-│       ├── CreatePrimCommand     — Undoable prim creation (with camera orientation)
-│       ├── DeletePrimCommand     — Undoable prim deletion (SdfCopySpec snapshot)
-│       ├── AttributeSetCommand   — Type-agnostic undoable attribute writes
-│       ├── AddReferenceCommand   — Undoable reference addition
-│       ├── ReplaceReferenceCommand — Undoable reference replacement
-│       └── LayerCommands         — Create, remove, reorder sublayers
+│       ├── TransformCommand          — Undoable translate/rotate/scale
+│       ├── CreatePrimCommand         — Undoable prim creation (with camera orientation)
+│       ├── DeletePrimCommand         — Undoable prim deletion (SdfCopySpec snapshot)
+│       ├── RenamePrimCommand         — Undoable prim rename
+│       ├── ReparentPrimCommand       — Undoable reparent via UsdNamespaceEditor
+│       ├── GroupPrimsCommand         — Group selected prims under a new Xform
+│       ├── AttributeSetCommand       — Type-agnostic undoable attribute writes
+│       ├── AddReferenceCommand       — Undoable reference addition
+│       ├── ReplaceReferenceCommand   — Undoable reference replacement
+│       ├── CreateShaderNodeCommand   — Undoable UsdShadeShader creation (Material Editor)
+│       ├── ConnectShaderAttrsCommand — Undoable shader input↔output connection
+│       ├── DisconnectShaderAttrCommand — Undoable shader connection removal
+│       └── LayerCommands             — Create, remove, reorder sublayers
 ├── ui/                       — ImGui panels and application shell
-│   ├── Application           — App shell (owns managers/panels, docking, menus)
-│   ├── ImGuiContext           — Win32+OpenGL+ImGui initialization and loop
-│   ├── ViewportPanel         — Viewport container (layout, divider drag, maximize)
-│   ├── ViewportTile          — Single viewport tile (camera, rendering, overlays, picking)
-│   ├── SceneHierarchyPanel   — Prim tree browser with context menus
-│   ├── PropertyPanel         — Attribute/transform editor (channel box-style)
-│   ├── LayerPanel            — Layer stack editor with modal dialogs
-│   ├── TransformManipulator  — ImDrawList gizmo (move/rotate/scale)
-│   └── IconManager           — SVG icon rasterization via NanoSVG
+│   ├── Application            — App shell (owns managers/panels, docking, menus)
+│   ├── ImGuiContext            — Win32+OpenGL+ImGui initialization and loop
+│   ├── ViewportPanel           — Viewport container (layout, divider drag, maximize)
+│   ├── ViewportTile            — Single viewport tile (camera, rendering, overlays, picking)
+│   ├── SceneHierarchyPanel     — Prim tree browser with context menus
+│   ├── PropertyPanel           — Attribute/transform editor (channel box-style)
+│   ├── StageEditorPanel        — Layer stack editor (edit target, dirty state, drag-drop ordering)
+│   ├── TimelinePanel           — Transport controls, loop/bounce, frame scrub, Playblast
+│   ├── CurveEditorPanel        — Maya-style F-curve editor (Bezier ↔ USD time samples)
+│   ├── MaterialEditorPanel     — Hypershade-style UsdShade node-graph editor
+│   ├── MaterialPreviewRenderer — Shader-ball preview: independent Hydra instance + scratch stage
+│   ├── NodeThumbnailCache      — Async texture decode + amortized shader-ball thumbnails for the node canvas
+│   ├── TransformManipulator    — ImDrawList gizmo (move/rotate/scale)
+│   ├── IconManager             — SVG icon rasterization via NanoSVG
+│   └── NodeEditor/             — Vendored/patched imgui-node-editor
 └── utils/                    — Cross-cutting utilities
-    ├── Logger                — Thread-safe logging (file + console)
+    ├── Logger                — Thread-safe logging (file + console); also sinks USD TF_WARN/TF_ERROR
     ├── FileDialog            — Win32 file open/save dialogs
     ├── PathUtils             — Exe-relative path resolution
+    ├── OcioConfigParser      — Enumerates displays/views/colorspaces/looks from the active OCIO config
+    ├── MovieEncoder          — Streams RGBA frames to H.264/MP4 via libavcodec (Playblast)
     └── GLExt                 — GLAD extension initialization
 ```
 
@@ -111,6 +129,7 @@ src/
 - **Panel-Manager Separation** — UI panels hold pointers to core managers but contain no USD layer/prim logic
 - **Callback Wiring** — Cross-panel communication via `std::function` callbacks (e.g. viewport pick → hierarchy select → property panel update)
 - **Render-Delegate Plugability** — `UsdSceneRenderer` can switch Hydra render plugins at runtime
+- **Own Color Correction Pass** — Hydra's `HdxColorCorrectionTask` is bypassed; a file-local `ViewportColorCorrector` (inside `UsdSceneRenderer.cpp`) applies sRGB/OCIO as a fullscreen GL pass after Hydra renders linear (see `docs/adr/0001-viewport-color-correction.md`)
 - **Gizmo as 2D Overlay** — `TransformManipulator` uses pure `ImDrawList` calls (no GL resources), same approach as ImGuizmo
 
 ## Project Configuration
@@ -121,6 +140,7 @@ src/
 | `cmake/modules/FindImgui.cmake` | ImGui source integration |
 | `cmake/modules/FindGlad.cmake` | GLAD loader setup |
 | `CMakePresets.json` | Build presets (VS 17 2022, x64) |
+| `docs/adr/` | Architecture decision records |
 | `AGENTS.md` | AI agent build/architecture guide |
 | `.kilo/` | Kilo AI configuration (commands, agents, skills) |
 | `openspec/changes/` | Feature proposals and implementation tracking |
@@ -149,12 +169,11 @@ Before writing any OpenUSD API call, verify the API exists in the actual SDK:
 findstr /r /s "FunctionName" third_party\OpenUSD_v25.05\include\
 ```
 
-Always build and install before running tests:
+Always build and install before manually verifying a change:
 
 ```powershell
 cmake --build build --config Release
 cmake --install build --config Release
-ctest --test-dir build -C Release
 ```
 
 ## License