f.slack.post currently accepts plain text; extend to accept Block Kit + attachments per @relayfile/relay-helpers slackClient's typed shape. Improves demo UX: real Slack messages with buttons, sections, dividers. Types generated from Slack's OpenAPI Block Kit schema (already in relay-helpers dist). Follows N pattern for provider typing.
f.slack.post currently accepts plain text; extend to accept Block Kit + attachments per @relayfile/relay-helpers slackClient's typed shape. Improves demo UX: real Slack messages with buttons, sections, dividers. Types generated from Slack's OpenAPI Block Kit schema (already in relay-helpers dist). Follows N pattern for provider typing.