Skip benchmark workflow for bot review events

Bot reviews (AI code reviewers) trigger pull_request_review events that
start a new Benchmark workflow run. The concurrency group then cancels
the real benchmark run from the pull_request event, causing all
benchmark jobs to be cancelled on every PR with AI reviewers enabled.

Fix: skip the workflow early when the review author is a Bot account.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: sbryngelson

.github/workflows/bench.yml

@@ -13,6 +13,9 @@ concurrency:
 jobs:
   file-changes:
     name: Detect File Changes
+    if: >
+      github.event_name != 'pull_request_review' ||
+      github.event.review.user.type != 'Bot'
     runs-on: 'ubuntu-latest'
     outputs:
       checkall: ${{ steps.changes.outputs.checkall }}