feat(FN-3952): expose full mesh state aggregation and fix graph selection b

Exposed full mesh state aggregation via mesh routes with corresponding tests, refined the dependency graph to decouple node selection from opening task details, and documented the new aggregation API.

Fusion-Task-Id: FN-3952

plugins/fusion-plugin-dependency-graph/src/GraphTaskNode.tsx

@@ -105,8 +105,8 @@ export function GraphTaskNode({
       data-current-step={isActive && hasValidCurrentStep ? String(task.currentStep) : undefined}
       onMouseEnter={onMouseEnter}
       onMouseLeave={onMouseLeave}
-      onClick={(event) => {
-        onClick?.(event);
+      onClick={onClick}
+      onDoubleClick={(event) => {
         if (event.defaultPrevented) {
           return;
         }

plugins/fusion-plugin-dependency-graph/src/__tests__/DependencyGraph.highlighting.test.tsx

@@ -87,7 +87,7 @@ describe("DependencyGraph highlighting", () => {
     expect(screen.getByTestId("graph-task-node-A").className).toContain("graph-task-node--highlighted");
   });
 
-  it("applies edge dimming/highlighting and preserves click-to-detail", () => {
+  it("applies edge dimming/highlighting and preserves double-click-to-detail", () => {
     const onOpenDetail = vi.fn();
     render(<DependencyGraph tasks={tasks} onOpenDetail={onOpenDetail} />);
 
@@ -99,7 +99,7 @@ describe("DependencyGraph highlighting", () => {
     expect(edgeAB?.className.baseVal || edgeAB?.className).toContain("graph-edge--highlighted");
     expect(edgeCB?.className.baseVal || edgeCB?.className).toContain("graph-edge--highlighted");
 
-    fireEvent.click(screen.getByTestId("task-C"));
+    fireEvent.doubleClick(screen.getByTestId("graph-task-node-C"));
     expect(onOpenDetail).toHaveBeenCalledTimes(1);
     expect(onOpenDetail).toHaveBeenCalledWith(expect.objectContaining({ id: "C" }));
   });

plugins/fusion-plugin-dependency-graph/src/__tests__/DependencyGraph.test.tsx

@@ -117,18 +117,33 @@ describe("DependencyGraph", () => {
     expect(fitToGraph).toHaveBeenCalled();
   });
 
-  it("clicking a card triggers onOpenDetail exactly once", () => {
+  it("single-clicking a node selects it without opening detail", () => {
     const onOpenDetail = vi.fn();
     render(<DependencyGraph tasks={[createTask("A", "in-progress")]} onOpenDetail={onOpenDetail} />);
-    fireEvent.click(screen.getByTestId("task-A"));
+    const node = screen.getByTestId("graph-task-node-A");
+
+    fireEvent.click(node);
+
+    expect(node.className).toContain("graph-node--draggable");
+    expect(onOpenDetail).not.toHaveBeenCalled();
+  });
+
+  it("double-clicking a node opens detail", () => {
+    const onOpenDetail = vi.fn();
+    render(<DependencyGraph tasks={[createTask("A", "in-progress")]} onOpenDetail={onOpenDetail} />);
+
+    fireEvent.doubleClick(screen.getByTestId("graph-task-node-A"));
+
     expect(onOpenDetail).toHaveBeenCalledTimes(1);
     expect(onOpenDetail).toHaveBeenCalledWith(expect.objectContaining({ id: "A" }));
   });
 
-  it("falls back to onOpenTaskDetail when onOpenDetail is not provided", () => {
+  it("double-click falls back to onOpenTaskDetail when onOpenDetail is not provided", () => {
     const onOpenTaskDetail = vi.fn();
     render(<DependencyGraph tasks={[createTask("A", "in-progress")]} onOpenTaskDetail={onOpenTaskDetail} />);
-    fireEvent.click(screen.getByTestId("task-A"));
+
+    fireEvent.doubleClick(screen.getByTestId("graph-task-node-A"));
+
     expect(onOpenTaskDetail).toHaveBeenCalledWith("A");
   });
 

plugins/fusion-plugin-dependency-graph/src/__tests__/GraphTaskNode.test.tsx

@@ -220,18 +220,17 @@ describe("GraphTaskNode", () => {
     expect(screen.getByTestId("graph-task-node-FN-TEST").hasAttribute("data-current-step")).toBe(false);
   });
 
-  it("clicking card opens task detail exactly once", () => {
+  it("double-clicking card opens task detail exactly once", () => {
     const props = createProps(createTask());
     const { container } = render(<GraphTaskNode {...props} />);
 
-    const card = container.querySelector(".card");
-    expect(card).toBeTruthy();
-    fireEvent.click(card!);
+    const node = screen.getByTestId("graph-task-node-FN-TEST");
+    fireEvent.doubleClick(node);
     expect(props.onOpenDetail).toHaveBeenCalledTimes(1);
     expect(props.onOpenDetail).toHaveBeenCalledWith(expect.objectContaining({ id: "FN-TEST" }));
   });
 
-  it("clicking active indicator surface opens task detail", () => {
+  it("single click on active indicator surface does not open task detail", () => {
     const props = createProps(createTask({ column: "in-progress", status: "executing" }));
     const { container } = render(<GraphTaskNode {...props} />);
 
@@ -239,8 +238,7 @@ describe("GraphTaskNode", () => {
     expect(indicator).toBeTruthy();
     fireEvent.click(indicator!);
 
-    expect(props.onOpenDetail).toHaveBeenCalledTimes(1);
-    expect(props.onOpenDetail).toHaveBeenCalledWith(expect.objectContaining({ id: "FN-TEST" }));
+    expect(props.onOpenDetail).not.toHaveBeenCalled();
   });
 
   it("applies highlighted class only when requested", () => {

plugins/fusion-plugin-dependency-graph/src/__tests__/host-integration.test.ts

@@ -67,7 +67,7 @@ describe("dependency graph plugin host integration contract", () => {
       }),
     );
 
-    fireEvent.click(screen.getByTestId("task-FN-HOST"));
+    fireEvent.doubleClick(screen.getByTestId("graph-task-node-FN-HOST"));
     expect(openTaskDetail).toHaveBeenCalledTimes(1);
     expect(openTaskDetail).toHaveBeenCalledWith(expect.objectContaining({ id: "FN-HOST" }));
   });

plugins/fusion-plugin-dependency-graph/src/__tests__/interactions.test.tsx

@@ -72,11 +72,11 @@ describe("dependency graph interactions", () => {
     expect(result.current.pan.y).toBeCloseTo(150, 3);
   });
 
-  it("clicking a node opens task detail", () => {
+  it("double-clicking a node opens task detail", () => {
     const onOpenDetail = vi.fn();
     render(<DependencyGraph tasks={[createTask("A", "in-progress")]} onOpenDetail={onOpenDetail} />);
 
-    fireEvent.click(screen.getByTestId("task-A"));
+    fireEvent.doubleClick(screen.getByTestId("graph-task-node-A"));
     expect(onOpenDetail).toHaveBeenCalledTimes(1);
     expect(onOpenDetail).toHaveBeenCalledWith(expect.objectContaining({ id: "A" }));
     expect(screen.getAllByText(/Executing/).length).toBeGreaterThan(0);