fix: resolve checkerboard artifact in brush strokes and update AGENTS.md for v3.05

AGENTS.md

@@ -1,8 +1,8 @@
-# HCIE-Rust v4 — AI-Aware Architecture
+# HCIE-Rust v3.05 — AI-Aware Architecture
 
 ## Mission Statement
 
-HCIE-Rust v4 is a pixel-grade image editor built around an atomic project split that prevents automated agents from corrupting the engine while still allowing them to iterate on the graphical user interface.
+HCIE-Rust v3.05 is a pixel-grade image editor built around an atomic project split that prevents automated agents from corrupting the engine while still allowing them to iterate on the graphical user interface. The active native GUI is the **Iced** workspace (`hcie-iced-app/`). The `hcie-egui-app/` workspace is legacy/frozen — do not modify it for new features.
 
 ## Atomic Crate Split (23 crates / 6 layers)
 
@@ -56,13 +56,16 @@ One GUI workspace exists:
 
 | Crate / Project | Directory | Responsibility | Dependencies |
 |-----------------|-----------|----------------|--------------|
-| `hcie-egui-app` | `hcie-egui-app/` | Workspace root for the native GUI. | `hcie-engine-api`, `eframe`, panels |
-| `hcie-gui-egui` | `hcie-egui-app/crates/hcie-gui-egui/` | Main binary and application orchestration. | `hcie-engine-api`, panels |
-| `egui-panel-adapter` | `hcie-egui-app/crates/egui-panel-adapter/` | Dynamic schema-to-widget UI binder. | `hcie-engine-api` |
-| `egui-panel-filters` | `hcie-egui-app/crates/egui-panel-filters/` | Filter parameter panels. | `hcie-engine-api` |
-| `egui-panel-ai-chat` | `hcie-egui-app/crates/egui-panel-ai-chat/` | AI chat panel. | `hcie-engine-api`, `hcie-ai` |
-| `egui-panel-script` | `hcie-egui-app/crates/egui-panel-script/` | Scripting / automation panel. | `hcie-engine-api` |
-| `egui-panel-ai-script` | `hcie-egui-app/crates/egui-panel-ai-script/` | AI-assisted script generation panel. | `hcie-engine-api`, `egui-panel-script` |
+| `hcie-iced-app` | `hcie-iced-app/` | Workspace root for the native Iced GUI. | `hcie-engine-api`, `hcie-iced-gui`, panels |
+| `hcie-iced-gui` | `hcie-iced-app/crates/hcie-iced-gui/` | Main binary and application orchestration. | `hcie-engine-api`, panels |
+| `iced-panel-adapter` | `hcie-iced-app/crates/iced-panel-adapter/` | Dynamic schema-to-widget UI binder. | `hcie-engine-api` |
+| `iced-panel-ai-chat` | `hcie-iced-app/crates/iced-panel-ai-chat/` | AI chat panel. | `hcie-engine-api`, `hcie-ai` |
+| `iced-panel-script` | `hcie-iced-app/crates/iced-panel-script/` | Scripting / automation panel. | `hcie-engine-api` |
+| `hcie-dry-media-brushes` | `hcie-iced-app/crates/hcie-dry-media-brushes/` | Dry-media brush presets (graphite, charcoal, pastel). | `hcie-engine-api` |
+| `hcie-watercolor-brushes` | `hcie-iced-app/crates/hcie-watercolor-brushes/` | Watercolor brush presets. | `hcie-engine-api` |
+| `hcie-ink-brushes` | `hcie-iced-app/crates/hcie-ink-brushes/` | Ink brush presets. | `hcie-engine-api` |
+| `hcie-paint-brushes` | `hcie-iced-app/crates/hcie-paint-brushes/` | Paint brush presets. | `hcie-engine-api` |
+| `hcie-digital-brushes` | `hcie-iced-app/crates/hcie-digital-brushes/` | Digital/vector brush presets. | `hcie-engine-api` |
 
 ## Critical Rules
 
@@ -82,7 +85,7 @@ Layer 2:  hcie-blend, hcie-history, hcie-brush-engine, hcie-draw,
 Layer 3:  hcie-document
 Layer 4:  hcie-engine-api (rlib + staticlib)
 Layer 5:  hcie-ai, hcie-vision
-Layer 6:  hcie-egui-app / hcie-gui-egui
+Layer 6:  hcie-iced-app / hcie-iced-gui
 ```
 
 ## Performance Protection Notes (CRITICAL — Regression Prevention)
@@ -126,13 +129,13 @@ If a new feature conflicts with one of these mechanisms, extend the existing API
 
 ## GUI Workspace Architecture (CRITICAL — AI Search Scope)
 
-Only one GUI workspace exists: `hcie-egui-app/`. The GUI crates are `hcie-gui-egui/` and `egui-panel-*/`.
+Only one GUI workspace exists: `hcie-iced-app/`. The GUI crates are `hcie-iced-gui/` and `iced-panel-*/`. The `hcie-egui-app/` workspace is legacy and frozen.
 
 ### AI Search Rule
 
 When searching for a crate, module, file, or symbol:
 
-1. Scan the active GUI workspace first (`hcie-egui-app/`).
+1. Scan the active GUI workspace first (`hcie-iced-app/`).
 2. Then scan sibling engine crates (`../hcie-*/`).
 3. Follow the `Cargo.toml` dependency chain; if a dependency lives in another workspace, scan that workspace too.
 4. If a symbol name appears in two different modules (for example, `plugins/`), examine both.
@@ -169,15 +172,18 @@ Use `unlock.sh <crate>` to temporarily open a crate, make the required change, t
 
 ## Open Files (agents may write here)
 
-### Active egui GUI
+### Active Iced GUI
 
-- `hcie-egui-app/crates/hcie-gui-egui/src/*.rs`
-- `hcie-egui-app/crates/hcie-gui-egui/Cargo.toml`
-- `hcie-egui-app/crates/egui-panel-adapter/src/*.rs`
-- `hcie-egui-app/crates/egui-panel-filters/src/*.rs`
-- `hcie-egui-app/crates/egui-panel-ai-chat/src/*.rs`
-- `hcie-egui-app/crates/egui-panel-script/src/*.rs`
-- `hcie-egui-app/crates/egui-panel-ai-script/src/*.rs`
+- `hcie-iced-app/crates/hcie-iced-gui/src/*.rs`
+- `hcie-iced-app/crates/hcie-iced-gui/Cargo.toml`
+- `hcie-iced-app/crates/iced-panel-adapter/src/*.rs`
+- `hcie-iced-app/crates/iced-panel-ai-chat/src/*.rs`
+- `hcie-iced-app/crates/iced-panel-script/src/*.rs`
+- `hcie-iced-app/crates/hcie-dry-media-brushes/src/*.rs`
+- `hcie-iced-app/crates/hcie-watercolor-brushes/src/*.rs`
+- `hcie-iced-app/crates/hcie-ink-brushes/src/*.rs`
+- `hcie-iced-app/crates/hcie-paint-brushes/src/*.rs`
+- `hcie-iced-app/crates/hcie-digital-brushes/src/*.rs`
 
 
 ## Important Notes
@@ -185,7 +191,7 @@ Use `unlock.sh <crate>` to temporarily open a crate, make the required change, t
 - Never add an `egui` dependency to any engine crate.
 - Never access `hcie-protocol` directly from GUI code.
 - Never import a locked engine crate directly from GUI code; route everything through `hcie-engine-api`.
-- The root `hcie-egui-app/Cargo.toml` currently lists `hcie-protocol`, `hcie-blend`, and `hcie-io` for legacy compatibility. Do not add new direct engine dependencies there.
+- The active GUI workspace is `hcie-iced-app/`. Treat `hcie-egui-app/` as read-only legacy reference.
 
 ## Engine API — Public Surface