agenticjobs 0.3.0: the board sends its own sign-in email now

agenticjobs 0.3.0: the board sends its own sign-in email now.

An SMTP_URL nothing read meant the "no mail server" branch was true everywhere, so the login page handed a sign-in link to whoever typed an address.

https://dev.profullstack.com/~anthony/blog/095-post.html