implement six-skill gstack 2 runtime

ios-sync/SKILL.md

@@ -1,5 +1,5 @@
 ---
-name: ios-sync
+name: gstack-1-ios-sync
 preamble-tier: 3
 version: 1.0.0
 description: Regenerate the iOS debug bridge against the latest upstream gstack templates. (gstack)
@@ -15,6 +15,8 @@ triggers:
   - resync the ios debug bridge
   - regenerate ios accessors
   - update the gstack ios instrumentation
+metadata:
+  internal: true
 ---
 <!-- AUTO-GENERATED from SKILL.md.tmpl — do not edit directly -->
 <!-- Regenerate: bun run gen:skill-docs -->