test(aenv): add e2e resilience tests for pod crash and network jitter

Add test_e2e_resilience.py covering SDK recovery scenarios:
- Tool call recovery after api-service pod restart
- Session rebuild after transient network failure
- Instance preservation across session rebuilds
- Concurrent tool calls during network jitter
- Circuit breaker behavior under rapid failures

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

Author: JacksonMei