listConversationMembers returns a page of member IDs for any Slack
conversation type. Pass those IDs to Get member
when you need profile details.
Example
automations/list-channel-members.automation.ts
Inputs
Output
ReturnsSignal<{ memberIds: string[]; responseMetadata: { nextCursor?: string } }>.
The IDs are Slack user IDs, not email addresses or display names.