[codex] Remove duplicate idle_poll name parameter

[chaochaoweb3]

Summary

• remove the redundant agent_name parameter from idle_poll
• use name consistently for inbox polling and task claiming
• update the only s17 call site to pass the teammate name once

Fixes #374.

Validation

• python3 -m py_compile s17_autonomous_agents/code.py
• git diff --check

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