+ Break-out functionality in `sendMessage` into separate procedures,
  namespaced by domain (e.g. `messages`, `facts`, `factTriggers`).
  + Make a `withDbWrite` function to wrap the calls to these procedures, so
    as to separate the generation of data from persisting it.
+ Somehow subscribe the UI to events from the `sendMessage` procedure,
  so the user knows what's going on.
+ Parallelize the generation of data, so that the UI doesn't freeze for
  so long while the data is being generated.
+ Chunk and generate embeddings for generated facts and fact triggers.
  And save them to a database.
+ Query the database for facts triggers that match the current
  conversation situation, and inject the facts they refer to into the
  conversation context.
+ Implement tool use. Including tool triggers similar to fact triggers.