fix(workspace): unblock CI — host visual_ref_enabled + radial-gradient clippy allow + fmt catch-up

Three independent CI-unblockers grouped to keep history clean:

1. op-host-desktop/chat_orchestrator.rs — add `visual_ref_enabled: false`
   to the DesignRequest literal so the workspace builds after S4 added
   the field. Same stub-plumbing pattern as the S3b-2 `concurrency`,
   S3b-4 `append_context`, S3c `validation_enabled` additions. Real
   intent-gate routing is task #27.

2. op-editor-core/render_backend.rs::fill_round_rect_radial_gradient —
   #[allow(clippy::too_many_arguments)] on the trait default. The
   radial-gradient hook carries (rect, radius, stops, cx_frac, cy_frac,
   radius_frac, opacity) per the TS pen-renderer contract; that's the
   data shape, not refactorable without splitting the trait.

3. cargo fmt --all catch-up on 6 other files (op-editor-core /
   op-editor-ui / op-host-native) that pre-dated this branch and were
   never run through rustfmt. Pure whitespace, no semantic change. Lets
   `cargo fmt --all -- --check` pass workspace-wide.

`cargo clippy --workspace --all-targets -- -D warnings` + `cargo build
--workspace` + `cargo fmt --all -- --check` all clean. Tests across
op-orchestrator (574+1) / op-design-lint (149) / op-mcp (144) /
op-editor-core (273) / op-host-desktop (96) all green.

crates/op-editor-core/src/color_picker.rs

@@ -294,10 +294,7 @@ fn scalar_as_hex(s: &jian_ops_schema::variable::VariableScalar) -> Option<String
 /// `None` when the first fill isn't a gradient or `index` is out of
 /// range — the same gating `set_primary_gradient_stop_hex` applies
 /// on the write path.
-fn gradient_stop_hex(
-    node: &jian_ops_schema::node::PenNode,
-    index: usize,
-) -> Option<String> {
+fn gradient_stop_hex(node: &jian_ops_schema::node::PenNode, index: usize) -> Option<String> {
     use jian_ops_schema::style::PenFill;
     let fills = crate::fills::node_fills(node)?;
     let first = fills.first()?;

crates/op-editor-core/src/mutators.rs

@@ -465,11 +465,7 @@ impl EditorState {
             }
             PropertyFocus::GradientStopOffset(index) => {
                 // Percent → fraction. Clamp happens inside the setter.
-                let _ = crate::fills::set_primary_gradient_stop_offset(
-                    node,
-                    index,
-                    value / 100.0,
-                );
+                let _ = crate::fills::set_primary_gradient_stop_offset(node, index, value / 100.0);
             }
             // Hex focuses route through the dedicated colour setters
             // (a typed-in hex is parsed by the host before commit), so

crates/op-editor-core/src/render_backend.rs

@@ -370,6 +370,7 @@ pub trait RenderBackend {
     ///
     /// Default impl falls back to a solid first-stop fill, same as
     /// the linear variant.
+    #[allow(clippy::too_many_arguments)]
     fn fill_round_rect_radial_gradient(
         &mut self,
         rect: Rect,

crates/op-editor-core/src/ui_draft.rs

@@ -60,9 +60,7 @@ impl PropertyFocus {
     pub fn is_hex(self) -> bool {
         matches!(
             self,
-            PropertyFocus::FillHex
-                | PropertyFocus::StrokeHex
-                | PropertyFocus::GradientStopHex(_)
+            PropertyFocus::FillHex | PropertyFocus::StrokeHex | PropertyFocus::GradientStopHex(_)
         )
     }
 

crates/op-editor-ui/src/widgets/property_panel.rs

@@ -307,9 +307,7 @@ impl NodeSnapshot {
 /// fills — the Fill section uses that to hide the angle row.
 fn gradient_angle_of(node: &PenNode) -> Option<f32> {
     use jian_ops_schema::style::PenFill;
-    match op_editor_core::fills::node_fills(node)
-        .and_then(|f| f.first())?
-    {
+    match op_editor_core::fills::node_fills(node).and_then(|f| f.first())? {
         PenFill::LinearGradient(body) => Some(body.angle.unwrap_or(0.0)),
         _ => None,
     }

crates/op-editor-ui/src/widgets/property_panel_fill.rs

@@ -523,8 +523,10 @@ fn paint_fill_gradient_body(
             Point2D::new(0.0, 0.0),
         );
         let hex_text_x = hex_rect.origin.x + 30.0;
-        cx.backend
-            .draw_text(&hex_layout, Point2D::new(hex_text_x, hex_rect.origin.y + 19.0));
+        cx.backend.draw_text(
+            &hex_layout,
+            Point2D::new(hex_text_x, hex_rect.origin.y + 19.0),
+        );
         if let Some(pos) = edit.caret_at(hex_focus) {
             let w = cx
                 .backend

crates/op-host-desktop/src/chat_orchestrator.rs

@@ -186,11 +186,12 @@ pub async fn run_design_request(
         model,
         provider: provider_id,
         design_md: state.doc.design_md.clone(),
-        // S3b-2 / S3b-4 / S3c additions — host 暂无路由,统一保守值。
+        // S3b-2 / S3b-4 / S3c / S4 additions — host 暂无路由,统一保守值。
         // 真实接线在 task #27 走 chat_runtime intent gate 时定。
         append_context: None,
         concurrency: 1,
         validation_enabled: false,
+        visual_ref_enabled: false,
     };
     let mut sink = DesktopDocSink::new(state);
     // Stub validation providers — production-visible, no-op. Host can

crates/op-host-native/src/widget_host/press_helpers.rs

@@ -172,9 +172,7 @@ pub(in crate::widget_host) fn property_focus_initial(
             .get(i)
             // Strip alpha so the input pill matches what paint shows.
             // Per-stop transparency rides through commit invisibly.
-            .map(|s| {
-                op_editor_ui::widgets::property_panel_fill::stop_hex_rgb_only(&s.hex)
-            })
+            .map(|s| op_editor_ui::widgets::property_panel_fill::stop_hex_rgb_only(&s.hex))
             .unwrap_or_else(|| "#000000".to_string()),
         F::GradientStopOffset(i) => panel
             .snapshot

crates/op-pen-loader/src/adapter_tests.rs

@@ -329,9 +329,7 @@ fn radial_gradient_payload_uses_authored_centre_and_radius() {
     let n = &r.payload.pages[0].children[0];
     let gradient = n.gradient.as_ref().expect("gradient must populate");
     match gradient {
-        crate::payload::GradientPayload::Radial {
-            cx, cy, radius, ..
-        } => {
+        crate::payload::GradientPayload::Radial { cx, cy, radius, .. } => {
             assert!((cx - 0.25).abs() < 0.01);
             assert!((cy - 0.75).abs() < 0.01);
             assert!((radius - 0.6).abs() < 0.01);
@@ -350,7 +348,10 @@ fn solid_fill_leaves_gradient_payload_unset() {
     }"##;
     let r = load(src);
     let n = &r.payload.pages[0].children[0];
-    assert!(n.gradient.is_none(), "solid fill must not populate gradient");
+    assert!(
+        n.gradient.is_none(),
+        "solid fill must not populate gradient"
+    );
 }
 
 #[test]

crates/op-pen-loader/src/layout_scene.rs

@@ -23,14 +23,15 @@
 
 use op_editor_ui::layout_scene::NodeKind;
 use op_editor_ui::layout_scene::{
-    LayoutScene, SceneFillType, SceneGradient, SceneGradientStop, SceneNode, ScenePage,
-    SceneStroke,
+    LayoutScene, SceneFillType, SceneGradient, SceneGradientStop, SceneNode, ScenePage, SceneStroke,
 };
 use op_editor_ui::scene_vars::VariableTable;
 use op_editor_ui::Color;
 
 use crate::editor_state_var_table;
-use crate::payload::{DocPayload, GradientPayload, GradientStopPayload, NodePayload, StrokePayload};
+use crate::payload::{
+    DocPayload, GradientPayload, GradientStopPayload, NodePayload, StrokePayload,
+};
 
 /// Build a paint-only [`LayoutScene`] from an editor state.
 ///