ci(staging): enable direct verification

Allow agents to run required checks manually against an exact commit before pushing it directly to staging, while retaining protected status checks.

.github/workflows/verify.yml

@@ -1,6 +1,7 @@
 name: Verify
 
 on:
+  workflow_dispatch:
   pull_request:
   push:
     branches: [staging, main]
@@ -11,10 +12,10 @@ concurrency:
 
 jobs:
   branch-policy:
-    if: github.event_name == 'pull_request'
     runs-on: ubuntu-latest
     steps:
       - name: Enforce promotion flow
+        if: github.event_name == 'pull_request'
         env:
           BASE_BRANCH: ${{ github.base_ref }}
           HEAD_BRANCH: ${{ github.head_ref }}
@@ -31,6 +32,9 @@ jobs:
             echo "Feature pull requests target staging; promotions target main" >&2
             exit 1
           fi
+      - name: Confirm direct verification
+        if: github.event_name != 'pull_request'
+        run: echo "Direct branch verification requested for $GITHUB_SHA"
 
   static:
     runs-on: ubuntu-latest