switch to create_app from http_server

fix step format, add tasks endpoint back

fix create_fastapi_app call remove env_name

restore SQLTask and SQLReward to models.py

use openenv base classes and fix yaml format to match working submissions

add grader endpoint

add grader endpoint, fix reward bounds and openenv.yaml

pin openenv-core version to force reinstall

add grader_fn to tasks endpoint

revert to working server

use openenv core base classes

commit missing openenv.yaml and server.py changes

fix grader serialization and tasks endpoint

fix /tasks endpoint format for validator

fix reward range to strict (0,1) exclusive

Fix server entrypoint packaging and align environment docs

fix state endpoint, author, and init exports

add tasks init file

fix folder structure