Install \dvx[s3]\ extra in update-archive action (needed for S3 remote)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: ryan-williams

actions/update-archive/action.yml

@@ -41,7 +41,7 @@ runs:
         cache: pnpm
         cache-dependency-path: .discord-agent/api/pnpm-lock.yaml
 
-    - run: pip install dvx
+    - run: pip install dvx[s3]
       shell: bash
 
     # Pull existing archive