Feature request: Remind Me

Keybase does not have a remind me feature like Slack does. Would it be possible to add similar functionality to the Keybase clients? See the following image attachment as an example from Slack.

The request describes a Slack-like reminder feature for Keybase clients and includes a Slack example image, but names no files, tests, or implementation entry points. Start by reviewing the client architecture and existing chat functionality, then define the supported clients, reminder behavior, and tests needed before implementation can be considered complete.

Written by the indexing model from the issue text.