Revert "TEMP: run wolfBoot TZ integration per-push to validate NSC refactor (revert before merge)"

This reverts commit d9c5bdb.

Author: aidangarske

.github/workflows/wolfboot-tz-integration.yml

@@ -11,10 +11,9 @@
 name: wolfBoot TrustZone integration nightly (m33mu)
 
 on:
-  # TEMPORARY: run per-push on the PR branch to validate the NSC transport
-  # refactor end-to-end under m33mu before merge. Revert to schedule-only.
-  push:
-  pull_request:
+  schedule:
+    # 07:00 UTC daily
+    - cron: '0 7 * * *'
   workflow_dispatch:
 
 permissions: