Hey doc, can you provide some actual source that HK does NOT provide Z visas for FT applicants to mainland China?

Z visas do not just 'arrive'. They are placed into your passport at China's consulates and embassies OVERSEAS. Hong Kong and Macau no longer provide this service. With rare exception you must arrive in person to request this service in the country of the passport that you hold.

You are now breaking the law by working illegally in China. As several complicit posters have commented, the risk of discovery is variable, depending on the location in which you work and your employer's criminal competency and 'quanxi'.

You can prepare for being arrested by saving the money that you need to buy a ticket home. Document your communication with your 'agent' by recording conversations and saving correspondence from them that pertains to their activities in providing your employment and misinforming you about your legal status. This may be valuable when the police are determining how to proceed with your fine, deportation or incarceration.

The only way to repair your illegal status is to leave China and acquire a Z visa by legal methods in your home country.