fix: allow curly braces in sed patterns

perf: better prompt, auto-inject first action, per-difficulty step caps

final: passed validation

fix: use exact [START]/[END] log format per task - validator counts these pairs

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: clamp reward at ALL exit paths - zero-health edge case was producing 0.0

fix: inference.py now loops over 3+ tasks, grade endpoints use URL paths, scores clamped (0,1)

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: install git-filter-repo via pip instead of apt, remove uv.lock

fix: add grader module + grader field on all 13 tasks in openenv.yaml

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

fix: add defaults for MODEL_NAME, API_BASE_URL, HF_TOKEN so inference.py never crashes on missing env vars

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fix: add HF Spaces YAML front matter

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initial commit