exec: networking_telnet+security_auth_bans — restore stop idling and permit gating

[Nostoi]

Summary

• restore ROM stop_idling behavior when players return from limbo via telnet input and cover it with a focused regression
• enforce BAN_PERMIT gating per-character and during creation so only PLR_PERMIT players enter from permit hosts, with new harnessed tests
• document the completed networking_telnet and security_auth_bans parity work in PYTHON_PORT_PLAN.md

Testing

• PYTHONPATH=. pytest tests/test_networking_telnet.py -q

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https://chatgpt.com/codex/tasks/task_b_68e850e39dfc8320b685ccb24d5f3a0a