fix(host): make vendor-hermes --silent actually silent

The spinners were passed `isEnabled: !silent`. A disabled ora spinner still
writes `- <text>` on start and the success/fail symbol on completion (to
stderr) — it only skips the animation. `isSilent` is the option that
suppresses output entirely.

Callers capture stdout only (`$(... --silent)` in CI and the Gradle error
message, backticks in patch-hermes.rb), so the stray output was noise rather
than a broken path, but `--silent` now does what it says.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HX4imsygeawVtsmoP1sj3F

Author: claude

.changeset/silent-vendor-hermes.md

@@ -0,0 +1,9 @@
+---
+"react-native-node-api": patch
+---
+
+Make `vendor-hermes --silent` actually silent. The spinners were passed
+`isEnabled: false`, which stops the animation but still writes the spinner text
+and its final symbol to stderr. They now use `isSilent`, which suppresses the
+output entirely, leaving the vendored Hermes path on stdout as the command's
+only output.

packages/host/src/node/cli/hermes.ts

@@ -85,7 +85,9 @@ export const command = new Command("vendor-hermes")
             successText: "Removed existing Hermes clone",
             failText: (error) =>
               `Failed to remove existing Hermes clone: ${error.message}`,
-            isEnabled: !silent,
+            // Not `isEnabled: false`: a disabled spinner still writes its text
+            // and final symbol to stderr, so `--silent` wasn't silent.
+            isSilent: silent,
           },
         );
       }
@@ -118,7 +120,7 @@ export const command = new Command("vendor-hermes")
               text: `Cloning Hermes into ${prettyPath(hermesPath)}`,
               successText: "Cloned Hermes",
               failText: (err) => `Failed to clone Hermes: ${err.message}`,
-              isEnabled: !silent,
+              isSilent: silent,
             },
           );
         } catch (error) {