ci(v2): authorize stacked migration PRs

Treat DEV-v2 as an authorized development base in build, artifact-comment, and PR restriction workflows. GitHub evaluates pull_request policy from the base branch, so child PR changes cannot authorize themselves.

This allows PRs 648 and 649 to run validation without weakening restrictions for unrelated target branches. Workflow diffs and git diff checks pass.

.github/workflows/comment-pr-artifacts.yml

@@ -32,7 +32,7 @@ jobs:
         shell: bash
         run: |
           set -euo pipefail
-          if [ "$BASE_REF" = "dev" ]; then
+          if [ "$BASE_REF" = "dev" ] || [ "$BASE_REF" = "DEV-v2" ]; then
             echo "allowed=true" >> "$GITHUB_OUTPUT"
             exit 0
           fi

.github/workflows/pr-build.yml

@@ -32,7 +32,7 @@ jobs:
         shell: bash
         run: |
           set -euo pipefail
-          if [ "$BASE_REF" = "dev" ]; then
+          if [ "$BASE_REF" = "dev" ] || [ "$BASE_REF" = "DEV-v2" ]; then
             echo "allowed=true" >> "$GITHUB_OUTPUT"
             exit 0
           fi

.github/workflows/restrict-non-dev-prs.yml

@@ -14,7 +14,7 @@ permissions:
 
 jobs:
   restrict-non-dev-prs:
-    if: ${{ github.event.pull_request.base.ref != 'dev' }}
+    if: ${{ github.event.pull_request.base.ref != 'dev' && github.event.pull_request.base.ref != 'DEV-v2' }}
     runs-on: ubuntu-latest
     env:
       ALLOWED_ACTORS: ${{ vars.ALLOWED_NON_DEV_PR_ACTORS }}
@@ -39,7 +39,7 @@ jobs:
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
-          gh pr comment "$PR_NUMBER" --body "Thanks for the contribution. PRs need to target \`dev\` branch. Please retarget this PR to the dev branch"
+          gh pr comment "$PR_NUMBER" --body "Thanks for the contribution. PRs need to target the \`dev\` or \`DEV-v2\` branch. Please retarget this PR to an authorized development branch."
 
       - name: Close unauthorized PR
         if: ${{ steps.auth.outputs.authorized != 'true' }}