Two-decimal scores, single tasks/graders.py, min three inference episodes

feat: six canonical tasks, task_registry, DaddyCoder-style graders layout

feat: canonical tasks/graders.py layout for Phase 2; wire inference and manifests

fix: grader scores strictly in (0,1); declare tasks_with_graders; README Phase 2 notes

fix: default to LLM when API_KEY/HF_TOKEN set; proxy API_KEY first

fix: use str.format for prompts (Py3.10/3.11 Phase2 SyntaxError)

Fix inference f-string + any other changes

Deploy OpenEnv to Space