moo.shell.tests.test_iac.test_parser_consumes_single_byte_iac_commands_silently

moo.shell.tests.test_iac.test_parser_consumes_single_byte_iac_commands_silently()

NOP/DM/BRK/IP/AO/AYT/EC/EL after IAC are valid single-byte commands the server is allowed to ignore — but the parser must consume them, not leak them into the residual byte stream.