New: environments/swe_smith_oracle_env.py
- Subclasses HermesAgentBaseEnv (proper tools= parameter, multi-model parsers)
- Uses ToolContext.terminal() for pytest verification
- Supports tool_pool_mode flag for sandbox backends
- Reads ATROPOS_SERVER_* env vars from .env
- No dependency on atropos/agent/ or atropos/envs/agent_env.py