fix: Module.serve should not modify the caller's core module (#7924)

* chore: ensure modules are always served semver engine versions

Signed-off-by: Justin Chadwell <me@jedevc.com>

* fix: Module.serve should not modify the caller's core module

The client is expecting a given API - loading a module *shouldn't*
update the version of the API that it's served. This was a minor design
mistake, and just doesn't make sense as is.

Signed-off-by: Justin Chadwell <me@jedevc.com>

* fix: add Terminal.sync for legacy terminal

With the last patch, there are now *no* fields on the `Terminal` type
that are served to a v0.12 CLI. This is an issue, because now, nothing
forces the evaluation of the type!

To avoid this, we add Terminal.sync, which allows the CLI to force
execution of a Terminal type, with a special field just for this. The
fact that this seemed to work before at all is pretty much coincidence.

Signed-off-by: Justin Chadwell <me@jedevc.com>

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Signed-off-by: Justin Chadwell <me@jedevc.com>