06-workshops - [Bug] 07-Tool Access with Policy: No resume/idempotency — re-running deploy hits 'already exists' errors

**In which component is this bug present?**

- [ ] 01-AgentCore-runtime
- [x] 02-AgentCore-gateway
- [ ] 03-AgentCore-identity
- [ ] 04-AgentCore-memory
- [ ] 05-AgentCore-tools
- [ ] 06-AgentCore-observability
- [ ] 07-AgentCore-E2E

**Bug Description**

If the deploy script fails mid-deploy, re-running hits "already exists" errors with no way to continue. There is no idempotency or resume capability.

**Suggested Fix**
Add idempotent checks (skip existing resources, resume from last step). For example, check if a resource already exists before attempting to create it, and skip creation if it does.