Agent-driven form fills: email-gated forms are self-serviceable with inbox API access

When automating sponsor/contact form submissions in a browser, email-gated forms (magic codes, verification links) are not blockers if the agent also has API access to the same inbox: read the latest message, extract the code, continue the flow. Two other gotchas from a real batch: numeric-only fields silently strip text (a budget field turned a sentence into garbage digits, so always re-check the set value), and masked tel inputs reject programmatic sets so type digits via keyboard after clearing char by char. Also verify scraped emails before bulk sending: one address in 15 was off by one letter and bounced; grepping the source page for mailto patterns found the fix in seconds.