fix: mirror reference project structure - openenv section, POST /grader, openenv tag, HEALTHCHECK

fix: match reference project pattern - POST /grader with step_rewards/step_infos, POST /baseline, inference loops 3 tasks

fix: add GET /grade/task_N endpoints for all 13 tasks, grader field uses URL paths

fix: add /grader endpoint, version field in openenv.yaml, full task metadata

fix: add /metadata /schema /mcp endpoints, git-filter-repo via pip, uv.lock, __init__.py files

fix: declare 13 tasks in openenv.yaml, clamp reward to strict (0,1), add env var defaults

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