Decide whether we need patterns at runtime. Maybe macros aren't obligated to return MacTree so destructuring can be done in a safer and easier way?

Double-check type and templating logic in the note, it's a bit fishy.

Consider whether all macros need to be loaded or the const references could be used to pre-filter for a given let line.

## alternate extension mechanism

The STD system will have a lot of traffic for trivial operations like algebra, stream IO will likely not be fast enough. A faster system is in order.

Ideally, it should reuse `orchid-extension` for message routing and decoding.

`orchid-host` accepts extensions as `impl ExtensionPort`

## Preprocessor extension

The macro system will not be privileged, it can take control from the interpreter via a custom top-level "let" line type.

Must actually write macro system as recorded in note

Check if any of this needs interpreter, if so, start with that