venture: statuses permission for the worker's test run; dedupe board rankings

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UpT7eWzeLhRwuYmsSQnbRb

.github/workflows/venture.yml

@@ -9,6 +9,7 @@ permissions:
   contents: write
   issues: write
   pages: write
+  statuses: write
 concurrency:
   group: venture
   cancel-in-progress: false