feat(FN-5610): externalize cpu-features in Bun build

Externalizes the `cpu-features` dependency from the CLI build step to support Bun compilation compatibility, completing Step 2 of the migration.

Fusion-Task-Id: FN-5610

Co-authored-by: Fusion (runfusion.ai) <noreply@runfusion.ai>
Fusion-Task-Id: FN-5610

packages/cli/build.ts

@@ -343,6 +343,9 @@ function compileBinary(outFile: string, target: string, isCrossCompile: boolean)
       // external so Bun's static bundler doesn't try to resolve it at compile.
       "--external",
       "react-devtools-core",
+      // cpu-features: native .node binding from ssh2 (transitive via dockerode); ssh2 falls back to pure JS when unavailable
+      "--external",
+      "cpu-features",
     ],
     cwd: workspaceRoot,
     stdout: "inherit",