feat(FN-2727): add node routing controls to CLI and dashboard

- Add CLI support for task node routing with create --node, task set-node, and task clear-node commands
- Extend settings command validation/output for defaultNodeId and unavailableNodePolicy and document new keys
- Surface task routing details in CLI task show plus dashboard Routing tab status/binding reason indicators
- Enhance Settings modal node routing UX with selected-node health status and add/refresh tests and changeset

packages/cli/src/__tests__/bin.test.ts

@@ -32,6 +32,8 @@ const commandMocks = vi.hoisted(() => ({
   runTaskComment: vi.fn(),
   runTaskComments: vi.fn(),
   runTaskSteer: vi.fn(),
+  runTaskSetNode: vi.fn(),
+  runTaskClearNode: vi.fn(),
   runTaskPrCreate: vi.fn(),
 
   runSettingsShow: vi.fn(),
@@ -122,6 +124,8 @@ vi.mock("../commands/task.js", () => ({
   runTaskComment: commandMocks.runTaskComment,
   runTaskComments: commandMocks.runTaskComments,
   runTaskSteer: commandMocks.runTaskSteer,
+  runTaskSetNode: commandMocks.runTaskSetNode,
+  runTaskClearNode: commandMocks.runTaskClearNode,
   runTaskPrCreate: commandMocks.runTaskPrCreate,
 }));