Fix staging composer dev dependency group

.github/scripts/personal-staging/README.md

@@ -203,5 +203,5 @@ is protected for real by the `staging-signing` Environment above.
 Offline (local temp git repos, no network, no gh):
 
 ```sh
-uv run --frozen --extra dev python -m pytest .github/scripts/personal-staging/
+uv run --frozen --group dev python -m pytest .github/scripts/personal-staging/
 ```

.github/workflows/personal-staging-hourly.yml

@@ -150,7 +150,7 @@ jobs:
           enable-cache: false
 
       - name: Test the staging composer
-        run: uv run --frozen --extra dev python -m pytest .github/scripts/personal-staging/
+        run: uv run --frozen --group dev python -m pytest .github/scripts/personal-staging/
 
   # Privileged (pushes refs/heads/staging) but runs ONLY the stdlib composer.
   # Independent of sync-main by design: staging stacks from upstream HEAD,

.github/workflows/personal-staging.yml

@@ -107,7 +107,7 @@ jobs:
           enable-cache: false
 
       - name: Test the staging composer
-        run: uv run --frozen --extra dev python -m pytest .github/scripts/personal-staging/
+        run: uv run --frozen --group dev python -m pytest .github/scripts/personal-staging/
 
       - name: Report failure
         if: failure()