didericis
923d44bc09
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The three concrete-backend package inits eagerly imported their `*BottleBackend` (which pulls the whole framework), so importing any leaf under them (e.g. `backend.docker.util`) paid ~78 modules. Give each the same thin `__getattr__` treatment as the top-level backend package: re-export the public class(es) lazily on first access, with a TYPE_CHECKING block for checkers. `import bot_bottle.backend.docker.util` drops from 78 -> 6 bot_bottle modules; the docker/firecracker/macos-container packages themselves are ~3 each. All `from bot_bottle.backend.docker import DockerBottleBackend` call-sites and the lazy selection path keep working. This is what makes backend leaves cheap — and unblocks moving docker_cmd into backend/docker/util if we want. Full unit suite green (2243). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>