Interface BuildOptions

redo the steps that are skippable, short of re-cloning

a local payload tarball, passed through to bun run hydrate --from=

regenerate the artifacts in the checkout rather than letting hydrate decide

Refuse to build from source; fail instead when there is no payload.

For a lane that must not spend minutes on a toolchain build it did not ask for -- CI, a scripted provision. NOT the default: drangler dev has to work on a clean machine with no flags, and before the first release there is no payload to work from, so a default of --payload-only would make the one command that has to work be the one command that cannot.

fetch and fast-forward an existing checkout; refuses on a dirty tree