Add Copilot multi-file dispatch regression test for push-to-pull-request-branch

.github/workflows/test-copilot-push-to-pull-request-branch-multi-file-using-dispatch.md

@@ -0,0 +1,59 @@
+---
+on:
+  workflow_dispatch:
+    inputs:
+      pull_request_number:
+        description: 'Pull request number'
+        required: true
+        type: number
+
+permissions: read-all
+
+engine:
+  id: copilot
+
+safe-outputs:
+  push-to-pull-request-branch:
+    target: ${{ inputs.pull_request_number }}
+    samples:
+      - message: "Dispatch-triggered multi-file push test from Copilot"
+        pull_request_number: "${{ github.event.inputs.pull_request_number }}"
+        patch: |
+          diff --git a/trials/copilot-multifile-a.md b/trials/copilot-multifile-a.md
+          new file mode 100644
+          --- /dev/null
+          +++ b/trials/copilot-multifile-a.md
+          @@ -0,0 +1,3 @@
+          +# Copilot Multi-file Dispatch Test A
+          +
+          +This file was created by the Copilot agentic workflow via workflow_dispatch.
+          diff --git a/trials/copilot-multifile-b.md b/trials/copilot-multifile-b.md
+          new file mode 100644
+          --- /dev/null
+          +++ b/trials/copilot-multifile-b.md
+          @@ -0,0 +1,3 @@
+          +# Copilot Multi-file Dispatch Test B
+          +
+          +This file was created by the Copilot agentic workflow via workflow_dispatch.
+---
+
+# Test Copilot Push to Branch (Dispatch, Multi-file)
+
+This test exercises `push-to-pull-request-branch` triggered via `workflow_dispatch`
+with a multi-file patch bundle.
+
+1. Checkout the branch for PR #${{ inputs.pull_request_number }}
+2. Create file `trials/copilot-multifile-a.md` with content:
+   ```markdown
+   # Copilot Multi-file Dispatch Test A
+
+   This file was created by the Copilot agentic workflow via workflow_dispatch.
+   ```
+3. Create file `trials/copilot-multifile-b.md` with content:
+   ```markdown
+   # Copilot Multi-file Dispatch Test B
+
+   This file was created by the Copilot agentic workflow via workflow_dispatch.
+   ```
+4. Commit both files in one commit
+5. Push the commit to the pull request branch for PR #${{ inputs.pull_request_number }}

README.md

@@ -65,6 +65,7 @@ Tracking the full matrix of [safe outputs](https://github.com/github/gh-aw/blob/
 - [x] `update-pull-request` — test-copilot-update-pull-request
 - [x] `push-to-pull-request-branch` (slash-command) — test-copilot-push-to-pull-request-branch-using-slash-command
 - [x] `push-to-pull-request-branch` (dispatch, local repo) — test-copilot-push-to-pull-request-branch-using-dispatch
+- [x] `push-to-pull-request-branch` (dispatch, local repo, multi-file) — test-copilot-push-to-pull-request-branch-multi-file-using-dispatch
 - [x] `push-to-pull-request-branch` (dispatch, side-repo) — test-copilot-siderepo-push-to-pull-request-branch-using-dispatch
 - [x] `push-to-pull-request-branch` (dispatch, side-repo, depth-1 sparse checkout `src/` + `docs/`) — test-copilot-siderepo-sparse-push-to-pull-request-branch-using-dispatch
 - [x] `create-pull-request-review-comment` — test-copilot-create-pull-request-review-comment

e2e.sh

@@ -573,6 +573,7 @@ get_all_tests() {
     echo "test-codex-push-to-pull-request-branch"
     echo "test-copilot-push-to-pull-request-branch-using-slash-command"
     echo "test-copilot-push-to-pull-request-branch-using-dispatch"
+    echo "test-copilot-push-to-pull-request-branch-multi-file-using-dispatch"
     echo "test-claude-create-pull-request-review-comment"
     echo "test-codex-create-pull-request-review-comment"
     echo "test-copilot-create-pull-request-review-comment"
@@ -3678,7 +3679,7 @@ run_single_test() {
                                     fi
                                 fi
                                 ;;
-                            *"push-to-pull-request-branch-using-dispatch")
+                            *"push-to-pull-request-branch-using-dispatch"|*"push-to-pull-request-branch-multi-file-using-dispatch")
                                 info "Creating test pull request to trigger $workflow..."
                                 local pr_info=$(create_test_pr_with_branch "Test PR for $ai_display_name Push-to-Branch (Dispatch)" "This PR is for testing $workflow" "$target_repo")
                                 if [[ -n "$pr_info" ]]; then