Bulk Redeploy Agents

Full redeploy of ALL active agents.

Auth: Admin JWT (superadmin) OR ADMIN_API_KEY header.

Performs the complete deploy pipeline for each active agent:

1. Re-read existing tokens from S3 (or generate new ones)
2. Regenerate workspace files (SOUL.md, AGENTS.md, etc.) + openclaw.json
3. Fetch vault env vars
4. Register new ECS task definition with fresh env vars
5. Update ECS service with new task def + force new deployment

This is the safe way to roll out agent image updates or config changes. Unlike raw ECS force-new-deployment, this ensures openclaw.json and task definitions are properly regenerated.