diff --git a/Cargo.lock b/Cargo.lock
index 26d334147..fe30ceec1 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2409,21 +2409,11 @@ dependencies = [
  "jian-ops-schema",
  "jian-skia",
  "op-editor-core",
- "openpencil-shell-core",
+ "op-editor-ui",
  "serde",
  "serde_json",
 ]
 
-[[package]]
-name = "openpencil-shell-core"
-version = "0.1.0"
-dependencies = [
- "jian-core",
- "op-editor-core",
- "op-editor-ui",
- "op-i18n",
-]
-
 [[package]]
 name = "option-ext"
 version = "0.2.0"
diff --git a/crates/op-editor-core/Cargo.toml b/crates/op-editor-core/Cargo.toml
index d7df5d1db..20c1fd0f0 100644
--- a/crates/op-editor-core/Cargo.toml
+++ b/crates/op-editor-core/Cargo.toml
@@ -16,5 +16,5 @@ jian-core = { path = "../../vendor/jian/crates/jian-core" }
 op-i18n = { path = "../op-i18n" }
 
 # render_backend.rs uses glam::Vec2 as Point2D (spec §5.2). Pinned to the
-# same version openpencil-shell-core uses so both crates resolve one glam.
+# same version op-editor-ui uses so both crates resolve one glam.
 glam = { version = "0.29", default-features = false, features = ["std"] }
diff --git a/crates/op-host-desktop/Cargo.toml b/crates/op-host-desktop/Cargo.toml
index 6c98bcbd4..1c79417e6 100644
--- a/crates/op-host-desktop/Cargo.toml
+++ b/crates/op-host-desktop/Cargo.toml
@@ -27,7 +27,7 @@ op-host-native = { path = "../op-host-native", version = "0.1.0" }
 # old shell-core `Document`.
 op-editor-core = { path = "../op-editor-core" }
 # Phase 7 strangler reorg: the MCP tool registry + JSON-RPC stdio layer
-# (`mcp.rs` + `mcp/*`) was extracted out of openpencil-shell-core into the
+# (`mcp.rs` + `mcp/*`) was extracted out of the dissolved shell-core into the
 # op-mcp crate; `mcp_serve.rs` registers tools through `op_mcp::*`.
 op-mcp = { path = "../op-mcp" }
 # Phase 7 strangler reorg: the transport-free AI chat data shapes
@@ -37,7 +37,7 @@ op-mcp = { path = "../op-mcp" }
 op-ai = { path = "../op-ai" }
 # Canonical `.op` (PenDocument) → shell `Document` loader / adapter.
 # Extracted out of this binary into a shared library crate so library
-# crates (openpencil-shell-native) can reuse the conversion;
+# crates (op-host-native) can reuse the conversion;
 # `persistence.rs` keeps only the desktop-only `rfd` Save/Open + error
 # dialogs.
 op-pen-loader = { path = "../op-pen-loader" }
diff --git a/crates/op-pen-loader/Cargo.toml b/crates/op-pen-loader/Cargo.toml
index 334144b0e..3237f6fc6 100644
--- a/crates/op-pen-loader/Cargo.toml
+++ b/crates/op-pen-loader/Cargo.toml
@@ -17,9 +17,10 @@ jian-core = { path = "../../vendor/jian/crates/jian-core" }
 # `MeasureBackend` plugged into the layout engine. Desktop-side, so
 # depending on skia is fine; this crate does NOT need to be wasm-clean.
 jian-skia = { path = "../../vendor/jian/crates/jian-skia", features = ["textlayout"] }
-# `Document` / `Node` / `VariableTable` etc. — the shell-core model
-# this crate converts INTO.
-openpencil-shell-core = { path = "../openpencil-shell-core", version = "0.1.0" }
+# Phase 7.3 reorg: openpencil-shell-core dissolved. The layout scene /
+# scene-var / render-backend facade this crate converts INTO now
+# resolves through the op-editor-ui crate.
+op-editor-ui = { path = "../op-editor-ui" }
 # `EditorState` — the canonical editor-state superset this crate
 # derives a paint-only `Document` (incl. its `var_table`) FROM. Lives
 # in op-pen-loader, NOT op-editor-core, so op-editor-core stays free of
diff --git a/crates/op-pen-loader/src/adapter.rs b/crates/op-pen-loader/src/adapter.rs
index 5c4462b0f..01d71cb18 100644
--- a/crates/op-pen-loader/src/adapter.rs
+++ b/crates/op-pen-loader/src/adapter.rs
@@ -91,8 +91,8 @@ pub fn pen_document_to_payload(doc: &PenDocument) -> LoadedDoc {
 /// the supported `VariableDefinition` variants; unknown future
 /// `VariableKind`s round-trip via their `Color/Number/Boolean/String`
 /// label since the enums are isomorphic.
-pub fn build_var_table(doc: &PenDocument) -> openpencil_shell_core::scene_vars::VariableTable {
-    use openpencil_shell_core::scene_vars::{
+pub fn build_var_table(doc: &PenDocument) -> op_editor_ui::scene_vars::VariableTable {
+    use op_editor_ui::scene_vars::{
         ThemeAxis, ThemedValue, Variable, VariableKind, VariableTable, VariableValue,
     };
     let mut out = VariableTable::default();
@@ -137,8 +137,8 @@ pub fn build_var_table(doc: &PenDocument) -> openpencil_shell_core::scene_vars::
 
 fn map_scalar(
     s: &jian_ops_schema::variable::VariableScalar,
-) -> openpencil_shell_core::scene_vars::VariableScalar {
-    use openpencil_shell_core::scene_vars::VariableScalar;
+) -> op_editor_ui::scene_vars::VariableScalar {
+    use op_editor_ui::scene_vars::VariableScalar;
     match s {
         jian_ops_schema::variable::VariableScalar::Bool(b) => VariableScalar::Bool(*b),
         jian_ops_schema::variable::VariableScalar::Num(n) => VariableScalar::Num(*n),
diff --git a/crates/op-pen-loader/src/effects.rs b/crates/op-pen-loader/src/effects.rs
index 541be5564..8daaf8b71 100644
--- a/crates/op-pen-loader/src/effects.rs
+++ b/crates/op-pen-loader/src/effects.rs
@@ -4,7 +4,7 @@
 
 use jian_ops_schema::node::PenNode;
 use jian_ops_schema::style::PenEffect;
-use openpencil_shell_core::layout_scene::{DropShadow, Effect};
+use op_editor_ui::layout_scene::{DropShadow, Effect};
 use serde::{Deserialize, Serialize};
 
 /// Serializable mirror of `document::DropShadow`.
@@ -50,7 +50,7 @@ fn shadow_payload_to_effect(s: &ShadowPayload) -> Effect {
         offset_x: s.offset_x,
         offset_y: s.offset_y,
         blur: s.blur,
-        color: openpencil_shell_core::Color {
+        color: op_editor_ui::Color {
             r: s.color[0],
             g: s.color[1],
             b: s.color[2],
@@ -177,7 +177,7 @@ fn parse_hex(s: &str) -> Option<[f32; 4]> {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use openpencil_shell_core::Color;
+    use op_editor_ui::Color;
 
     #[test]
     fn parse_css_color_handles_rgba_and_hex() {
diff --git a/crates/op-pen-loader/src/layout_scene.rs b/crates/op-pen-loader/src/layout_scene.rs
index 713a5815e..57879d8f7 100644
--- a/crates/op-pen-loader/src/layout_scene.rs
+++ b/crates/op-pen-loader/src/layout_scene.rs
@@ -21,12 +21,12 @@
 //! transforms on them are lossless format conversions (colour array →
 //! struct, kind / fill-type string → enum).
 
-use openpencil_shell_core::layout_scene::NodeKind;
-use openpencil_shell_core::scene_vars::VariableTable;
-use openpencil_shell_core::layout_scene::{
+use op_editor_ui::layout_scene::NodeKind;
+use op_editor_ui::scene_vars::VariableTable;
+use op_editor_ui::layout_scene::{
     LayoutScene, SceneFillType, SceneNode, SceneStroke, ScenePage,
 };
-use openpencil_shell_core::Color;
+use op_editor_ui::Color;
 
 use crate::editor_state_var_table;
 use crate::payload::{DocPayload, NodePayload, StrokePayload};
@@ -82,7 +82,7 @@ pub fn editor_state_to_layout_scene(state: &op_editor_core::EditorState) -> Layo
 /// wins over the node's authored colour, mirroring the canvas
 /// painter's `var_table.fill_for(id).or(node.fill)`.
 fn node_payload_to_scene(node: &NodePayload, var_table: &VariableTable) -> SceneNode {
-    use openpencil_shell_core::{Point2D, Rect};
+    use op_editor_ui::{Point2D, Rect};
     let node_id = op_editor_core::NodeId::new(node.id.clone());
     SceneNode {
         id: node.id.clone(),
diff --git a/crates/op-pen-loader/src/lib.rs b/crates/op-pen-loader/src/lib.rs
index 92b1512bc..01d2f45e4 100644
--- a/crates/op-pen-loader/src/lib.rs
+++ b/crates/op-pen-loader/src/lib.rs
@@ -1,7 +1,7 @@
 //! Canonical `.op` (`PenDocument`) → `LayoutScene` loader / adapter.
 //!
-//! Extracted from `openpencil-desktop` so library crates (notably
-//! `openpencil-shell-native`) can reuse the conversion without
+//! Extracted from `op-host-desktop` so library crates (notably
+//! `op-host-native`) can reuse the conversion without
 //! depending on a binary crate.
 //!
 //! Three layers:
@@ -13,7 +13,7 @@
 //! - [`payload`] holds the `DocPayload` serde DTOs + the strict /
 //!   best-effort `load_canonical` parser.
 //! - [`layout_scene`] re-shapes a resolved `DocPayload` into the
-//!   paint-only `openpencil_shell_core::layout_scene::LayoutScene`.
+//!   paint-only `op_editor_ui::layout_scene::LayoutScene`.
 //!
 //! This crate is desktop-side and may depend on skia; it does NOT
 //! need to be wasm-clean. The `rfd` Save/Open dialogs + error
@@ -63,10 +63,10 @@ pub use variables::{var_table_from_payload, var_table_to_payload, VarTablePayloa
 /// any shell-core dependency to keep its `wasm32-unknown-unknown`
 /// invariant.
 ///
-/// [`VariableTable`]: openpencil_shell_core::scene_vars::VariableTable
+/// [`VariableTable`]: op_editor_ui::scene_vars::VariableTable
 pub fn editor_state_var_table(
     state: &op_editor_core::EditorState,
-) -> openpencil_shell_core::scene_vars::VariableTable {
+) -> op_editor_ui::scene_vars::VariableTable {
     use op_editor_core::NodeId;
     // Persisted definitions + theme axes — `EditorState.doc` is a
     // `PenDocument`, so `build_var_table` harvests them directly.
diff --git a/crates/op-pen-loader/src/variables.rs b/crates/op-pen-loader/src/variables.rs
index 85e2de2e3..600c13d57 100644
--- a/crates/op-pen-loader/src/variables.rs
+++ b/crates/op-pen-loader/src/variables.rs
@@ -11,7 +11,7 @@
 
 use std::collections::BTreeMap;
 
-use openpencil_shell_core::scene_vars::{
+use op_editor_ui::scene_vars::{
     ThemeAxis, ThemedValue, Variable, VariableKind, VariableScalar, VariableTable,
     VariableValue,
 };
@@ -219,7 +219,7 @@ pub fn var_table_from_payload(p: &VarTablePayload) -> VariableTable {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use openpencil_shell_core::scene_vars::VariableValue;
+    use op_editor_ui::scene_vars::VariableValue;
 
     fn sample_table() -> VariableTable {
         let mut t = VariableTable::default();
diff --git a/crates/openpencil-shell-core/Cargo.toml b/crates/openpencil-shell-core/Cargo.toml
deleted file mode 100644
index e53daa37b..000000000
--- a/crates/openpencil-shell-core/Cargo.toml
+++ /dev/null
@@ -1,29 +0,0 @@
-[package]
-name = "openpencil-shell-core"
-version.workspace = true
-edition.workspace = true
-rust-version.workspace = true
-license.workspace = true
-description = "OpenPencil shell — re-export shim over op-editor-ui / op-editor-core / op-i18n (Phase 7 strangler reorg; dissolved in Task 7.3)"
-
-[lib]
-name = "openpencil_shell_core"
-path = "src/lib.rs"
-
-[dependencies]
-# v19 pivot: re-export Jian render/geometry/scene types (spec §5.2). The
-# `jian` module wraps jian-core; the crate root also re-exports
-# `jian_core::gesture` event types.
-jian-core = { path = "../../vendor/jian/crates/jian-core", version = "0.0.1" }
-
-# Phase 3 strangler reorg: i18n extracted into op-i18n; re-exported as `i18n`.
-op-i18n = { path = "../op-i18n" }
-
-# Phase 4 strangler reorg: the wasm-clean RenderBackend trait + facade
-# types live in op-editor-core; re-exported as `render_backend`.
-op-editor-core = { path = "../op-editor-core" }
-
-# Phase 7 strangler reorg: the widget facade + theme + layout scene +
-# scene-var aggregation live in op-editor-ui; re-exported so the hosts
-# keep resolving `openpencil_shell_core::widgets` / `::theme` / etc.
-op-editor-ui = { path = "../op-editor-ui" }
diff --git a/crates/openpencil-shell-core/src/jian.rs b/crates/openpencil-shell-core/src/jian.rs
deleted file mode 100644
index 365510cff..000000000
--- a/crates/openpencil-shell-core/src/jian.rs
+++ /dev/null
@@ -1,41 +0,0 @@
-//! Jian re-export module (spec v19 §2 / §1.2).
-//!
-//! `openpencil-shell-core` is a thin Jian wrapper — it re-exports
-//! `jian_core::render::{DrawOp, Paint, TextRun, …}` through the OP layer for
-//! shell-native's internal translation. geometry / scene types get a `Jian*`
-//! prefix to avoid clashing with OP's own `Rect` / `Color` (`render_backend.rs`).
-//!
-//! **Contract (spec §5.2.1, line 746)**: inside the NativeBackend impl, the
-//! v19 wrapper **must not let widget code see `jian_core::render::DrawOp`
-//! directly** — widgets only call OP `RenderBackend` methods. These re-exports
-//! are for **shell-native internal** translation, not for widget code.
-
-// ────────────────────────────────────────────────────────────────────────────
-// jian_core::render — DrawOp command buffer + Paint / TextRun / other draw descriptors
-// ────────────────────────────────────────────────────────────────────────────
-
-pub use jian_core::render::{
-    BorderRadii, DrawOp, GradientStop, ImageSource, LinearGradient, Paint, PathCommand,
-    RadialGradient, RenderCommand, ShadowSpec, StrokeOp, TextAlign, TextRun,
-};
-
-// ────────────────────────────────────────────────────────────────────────────
-// jian_core::geometry — `Jian*` prefix to avoid clashing with OP `Rect`
-// ────────────────────────────────────────────────────────────────────────────
-
-/// Jian's axis-aligned rectangle (`euclid::Rect<f32>`).
-/// OP's own `crate::render_backend::Rect` is for the widget facade; shell-native
-/// translates OP `Rect` → `JianRect` internally (`origin/size` → `euclid::Rect::new`).
-pub type JianRect = jian_core::geometry::Rect;
-pub type Size = jian_core::geometry::Size;
-pub type JianPoint = jian_core::geometry::Point;
-pub type Affine2 = jian_core::geometry::Affine2;
-
-// ────────────────────────────────────────────────────────────────────────────
-// jian_core::scene — Color (packed u32) gets a `Jian*` prefix
-// ────────────────────────────────────────────────────────────────────────────
-
-/// Jian's packed-RGBA color (`pub struct Color(pub u32)`); distinct from OP's
-/// `crate::render_backend::Color` (RGBA f32 quad). NativeBackend bit-packs when
-/// translating OP Color → JianColor.
-pub type JianColor = jian_core::scene::Color;
diff --git a/crates/openpencil-shell-core/src/lib.rs b/crates/openpencil-shell-core/src/lib.rs
deleted file mode 100644
index feed72a2d..000000000
--- a/crates/openpencil-shell-core/src/lib.rs
+++ /dev/null
@@ -1,47 +0,0 @@
-//! OpenPencil shell core — re-export shim.
-//!
-//! Per spec v19 §1.2 (FROZEN 2026-05-04): this crate must compile on
-//! wasm32-unknown-unknown. winit / accesskit_winit / skia-safe live in
-//! `openpencil-shell-native`; wasm-bindgen / web-sys / CanvasKit live in
-//! `openpencil-shell-web`.
-//!
-//! Phase 7 strangler reorg: the widget facade, theme, layout-resolved
-//! render scene, and design-variable aggregation were extracted into the
-//! `op-editor-ui` crate; i18n into `op-i18n`; the `RenderBackend` trait
-//! into `op-editor-core`; the MCP / codegen / figma / AI-chat modules
-//! into their own `op-*` crates. What remains here is a thin re-export
-//! shim so the hosts (`openpencil-shell-native` / `openpencil-shell-web`
-//! / `openpencil-desktop`) keep resolving `openpencil_shell_core::*`
-//! paths unchanged until the Task 7.3 host rename dissolves this crate.
-//!
-//! The [`jian`] module re-exports `jian_core::render::{DrawOp, Paint,
-//! TextRun, …}` + geometry/scene aliases for shell-native's internal
-//! translation (widget code never sees them).
-
-pub mod jian;
-
-// Phase 3 strangler reorg: i18n extracted into op-i18n. Re-exported as
-// `i18n` so `crate::i18n::translate` / `crate::i18n::Locale` resolve.
-pub use op_i18n as i18n;
-
-// Phase 4 strangler reorg: the wasm-clean RenderBackend trait moved into
-// op-editor-core. Re-exported as `render_backend`.
-pub use op_editor_core::render_backend;
-
-// Phase 7 strangler reorg: the widget facade + theme + layout scene +
-// scene-var aggregation moved into op-editor-ui. Re-exported so
-// `openpencil_shell_core::widgets` / `::theme` / `::layout_scene` /
-// `::layout_scene_hit` / `::scene_vars` paths still resolve.
-pub use op_editor_ui::{layout_scene, layout_scene_hit, scene_vars, theme, widgets};
-
-// Re-export the primary API for upstream crates / widgets / tests.
-pub use op_editor_core::render_backend::{Color, Point2D, Rect, RenderBackend, TextLayout};
-pub use op_editor_ui::Theme;
-
-/// Re-exports of Jian gesture / event types so shell consumers can use the
-/// canonical Jian types directly without an OP-specific translation layer.
-pub use jian_core::gesture::{
-    FocusEvent, ImeEvent, ImeKind, KeyCode, KeyEvent, KeyLocation, KeyState, KeyValue, Modifiers,
-    MouseButtons, NamedKey, PointerEvent, PointerId, PointerKind, PointerPhase, ScrollMode,
-    WheelEvent,
-};
diff --git a/crates/openpencil-shell-core/tests/gesture_re_export.rs b/crates/openpencil-shell-core/tests/gesture_re_export.rs
deleted file mode 100644
index e5f141999..000000000
--- a/crates/openpencil-shell-core/tests/gesture_re_export.rs
+++ /dev/null
@@ -1,111 +0,0 @@
-use openpencil_shell_core::{
-    FocusEvent, ImeEvent, ImeKind, KeyCode, KeyEvent, KeyLocation, KeyState, KeyValue, Modifiers,
-    MouseButtons, NamedKey, PointerEvent, PointerId, PointerKind, PointerPhase, ScrollMode,
-    WheelEvent,
-};
-
-#[test]
-fn pointer_event_is_re_exported_from_jian() {
-    let event = PointerEvent::simple(
-        7,
-        PointerPhase::Down,
-        jian_core::geometry::Point::new(12.0, 34.0),
-    );
-
-    let _: PointerEvent = event.clone();
-    let _: jian_core::gesture::PointerEvent = event.clone();
-
-    assert_eq!(event.id, PointerId(7));
-    assert_eq!(event.kind, PointerKind::Touch);
-    assert_eq!(event.phase, PointerPhase::Down);
-    assert_eq!(event.position.x, 12.0);
-    assert_eq!(event.position.y, 34.0);
-    assert!(event.buttons.contains(MouseButtons::LEFT));
-    assert!(event.modifiers.is_empty());
-}
-
-#[test]
-fn pointer_modifier_and_button_flags_keep_jian_names() {
-    let mods = Modifiers::SHIFT | Modifiers::CMD;
-    assert!(mods.contains(Modifiers::SHIFT));
-    assert!(mods.contains(Modifiers::CMD));
-    assert!(!mods.contains(Modifiers::CTRL));
-
-    let buttons = MouseButtons::LEFT | MouseButtons::RIGHT;
-    assert!(buttons.contains(MouseButtons::LEFT));
-    assert!(buttons.contains(MouseButtons::RIGHT));
-    assert!(!buttons.contains(MouseButtons::MIDDLE));
-}
-
-#[test]
-fn key_event_is_re_exported_from_jian_with_all_w3c_fields() {
-    let event = KeyEvent {
-        key: KeyValue::Named(NamedKey::Enter),
-        code: KeyCode::Enter,
-        location: KeyLocation::Right,
-        modifiers: Modifiers::SHIFT,
-        state: KeyState::Pressed,
-        repeat: true,
-        is_composing: true,
-    };
-    let _: jian_core::gesture::KeyEvent = event.clone();
-    // Round 2 Q5 fix: assert every W3C field reads back the value we set
-    // so cross-crate type identity AND field-level binary compat are
-    // both verified through the OP re-export path.
-    assert_eq!(event.key, KeyValue::Named(NamedKey::Enter));
-    assert_eq!(event.code, KeyCode::Enter);
-    assert_eq!(event.location, KeyLocation::Right);
-    assert!(event.modifiers.contains(Modifiers::SHIFT));
-    assert_eq!(event.state, KeyState::Pressed);
-    assert!(event.repeat);
-    assert!(event.is_composing);
-}
-
-#[test]
-fn ime_event_is_re_exported_from_jian() {
-    let event = ImeEvent {
-        kind: ImeKind::CompositionUpdate {
-            selection: Some(0..6),
-        },
-        text: "你好".to_string(),
-    };
-    let _: jian_core::gesture::ImeEvent = event.clone();
-    assert_eq!(event.text, "你好");
-    match event.kind {
-        ImeKind::CompositionUpdate { selection } => assert_eq!(selection, Some(0..6)),
-        _ => panic!("expected CompositionUpdate"),
-    }
-}
-
-#[test]
-fn focus_event_is_re_exported_from_jian_with_all_w3c_fields() {
-    let event = FocusEvent {
-        gained: false,
-        node_id_hint: Some(11),
-        related_node_id_hint: Some(7),
-    };
-    let _: jian_core::gesture::FocusEvent = event;
-    // Round 2 Q5 fix: assert all three W3C fields, not just gained.
-    assert!(!event.gained);
-    assert_eq!(event.node_id_hint, Some(11));
-    assert_eq!(event.related_node_id_hint, Some(7));
-}
-
-#[test]
-fn wheel_event_is_re_exported_from_jian_with_w3c_fields() {
-    let mut event = WheelEvent::simple(
-        jian_core::geometry::Point::new(10.0, 20.0),
-        jian_core::geometry::Point::new(0.0, 120.0),
-    );
-    // Defaults from WheelEvent::simple
-    assert_eq!(event.mode, ScrollMode::Pixel);
-    assert_eq!(event.delta_z, 0.0);
-    // Round 2 Q5 fix: assert mode + delta_z mutability + roundtrip
-    // through the OP re-export path matches Jian's behavior.
-    event.mode = ScrollMode::Line;
-    event.delta_z = -3.0;
-    assert_eq!(event.mode, ScrollMode::Line);
-    assert_eq!(event.delta_z, -3.0);
-    assert_eq!(event.delta.x, 0.0);
-    assert_eq!(event.delta.y, 120.0);
-}
diff --git a/crates/openpencil-shell-core/tests/jian_re_export.rs b/crates/openpencil-shell-core/tests/jian_re_export.rs
deleted file mode 100644
index e2aceb31f..000000000
--- a/crates/openpencil-shell-core/tests/jian_re_export.rs
+++ /dev/null
@@ -1,87 +0,0 @@
-//! Task 1 Step 20-21: prove the Jian re-export wrapper compiles & is usable.
-//!
-//! Two anchor invariants for spec v19 §2 / §5.2:
-//! 1. `DrawOp::Rect` constructible **through the OP re-export path**
-//!    (`openpencil_shell_core::jian::DrawOp` — used by shell-native's internal translation).
-//! 2. `TextLayout::single_run` produces **exactly one** `TextRun` (spec §5.2,
-//!    confirming the explicit-field replacement for `..Default::default()` is semantically equivalent).
-
-use openpencil_shell_core::jian::{DrawOp, JianRect, Paint};
-use openpencil_shell_core::render_backend::{Color, Point2D, TextLayout};
-
-#[test]
-fn drawop_rect_constructible_via_re_export() {
-    // Construct a Jian DrawOp::Rect via the OP re-export path — proves shell-core's
-    // jian module exposes jian_core::render::{DrawOp, Paint}.
-    let rect = JianRect::new(
-        jian_core::geometry::Point::new(0.0, 0.0),
-        jian_core::geometry::Size::new(100.0, 50.0),
-    );
-    let paint = Paint::solid(jian_core::scene::Color::rgb(255, 0, 0));
-    let op = DrawOp::Rect { rect, paint };
-
-    match op {
-        DrawOp::Rect { rect, .. } => {
-            assert_eq!(rect.size.width, 100.0);
-            assert_eq!(rect.size.height, 50.0);
-        }
-        _ => panic!("expected DrawOp::Rect"),
-    }
-}
-
-#[test]
-fn text_layout_single_run_creates_one_run() {
-    // Explicit-field construction (TextRun has no Default impl) — proves the
-    // spec §5.2 single_run path produces exactly one run with content /
-    // font_family / font_size set from the caller's arguments.
-    let layout = TextLayout::single_run(
-        "Hello",
-        "system-ui",
-        16.0,
-        jian_core::scene::Color::rgb(0, 0, 0),
-        Point2D::new(10.0, 20.0),
-    );
-
-    assert_eq!(layout.runs().len(), 1);
-
-    let run = &layout.runs()[0];
-    assert_eq!(run.content, "Hello");
-    assert_eq!(run.font_family, "system-ui");
-    assert_eq!(run.font_size, 16.0);
-    assert_eq!(run.font_weight, 400);
-    assert_eq!(run.origin.x, 10.0);
-    assert_eq!(run.origin.y, 20.0);
-    assert_eq!(run.max_width, 0.0);
-    assert_eq!(run.line_height, 0.0);
-}
-
-#[test]
-fn text_layout_translated_offsets_origin() {
-    // translated() adds offset to each run's origin; the original layout is unchanged.
-    let layout = TextLayout::single_run(
-        "World",
-        "system-ui",
-        14.0,
-        jian_core::scene::Color::rgb(0, 0, 0),
-        Point2D::new(5.0, 10.0),
-    );
-    let shifted = layout.translated(Point2D::new(100.0, 200.0));
-
-    assert_eq!(shifted.runs()[0].origin.x, 105.0);
-    assert_eq!(shifted.runs()[0].origin.y, 210.0);
-
-    // Original layout untouched.
-    assert_eq!(layout.runs()[0].origin.x, 5.0);
-    assert_eq!(layout.runs()[0].origin.y, 10.0);
-}
-
-#[test]
-fn op_color_constants_distinct() {
-    // spec §5.2 names all six constants — RED/GREEN/BLUE/BLACK/WHITE/TRANSPARENT.
-    assert_eq!(Color::RED.r, 1.0);
-    assert_eq!(Color::GREEN.g, 1.0);
-    assert_eq!(Color::BLUE.b, 1.0);
-    assert_eq!(Color::BLACK.r, 0.0);
-    assert_eq!(Color::WHITE.r, 1.0);
-    assert_eq!(Color::TRANSPARENT.a, 0.0);
-}