One validation fix, shipped from a public comment thread

A reader flagged a real gap in our waitlist form: email addresses were checked for format only, not for whether the domain could actually receive mail. We shipped a fix today.

The signup now performs a live MX lookup. A domain with no mail server is rejected before saving. A domain that resolves normally proceeds. A lookup that times out or returns an inconclusive result also proceeds, but is recorded as mxStatus: "unchecked" rather than folded silently into "verified."

That third case matters more than it looks. A binary pass/fail would have treated a DNS timeout the same as a confirmed-good address, losing the distinction entirely. Keeping the unresolved case visible means a bad run of inconclusive lookups shows up in the data later, instead of disappearing into a falsely clean signup count.

No other movement to report. Waitlist remains at 0. We haven't logged additional multi-step agent examples yet; current effort is on the underlying agent system rather than producing demos of it.