tmp: trigger layer-3 differential on this branch to prove the device path

workflow_dispatch cannot run pre-merge (it registers from the default branch), so
this temporary push trigger exists only to execute the never-run device path on
the PR head and capture evidence. Removed before merge.

Author: thymikee

.github/workflows/conformance-differential.yml

@@ -21,6 +21,17 @@ on:
       only:
         description: "Single scenario id to run (default: all)"
         required: false
+  # TEMPORARY — REMOVE BEFORE MERGE.
+  # workflow_dispatch only registers once a workflow is on the default branch, so
+  # this path cannot be dispatched pre-merge (the API returns 404). This trigger
+  # exists solely to prove the never-executed device path on the PR head and
+  # capture evidence. Delete this `push:` block once that run is green.
+  push:
+    branches:
+      - claude/maestro-conformance-oracle-acf8d5
+    paths:
+      - "scripts/maestro-conformance/**"
+      - ".github/workflows/conformance-differential.yml"
 
 permissions:
   contents: read