fix: reduce brew noise in onboarding

src/agents/skills-status.ts

@@ -111,6 +111,13 @@ function normalizeInstallOptions(
   entry: SkillEntry,
   prefs: SkillsInstallPreferences,
 ): SkillInstallOption[] {
+  // If the skill is explicitly OS-scoped, don't surface install actions on unsupported platforms.
+  // (Installers run locally; remote OS eligibility is handled separately.)
+  const requiredOs = entry.metadata?.os ?? [];
+  if (requiredOs.length > 0 && !requiredOs.includes(process.platform)) {
+    return [];
+  }
+
   const install = entry.metadata?.install ?? [];
   if (install.length === 0) {
     return [];