docs: reformat README for install, local run, and validation

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

openenv.yaml: add score_range per task; fix EOF newline

Validator delegates to validate-submission; three grader entry files for six tasks

refactor: single tasks/graders.py for all tasks, remove thin grader modules, add .env.example

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

feat: per-task grader entry files, distinct paths for validators, assets/outputs layout

refactor: consolidate grading into tasks/graders.py and tasks/database.py

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

fix: per-task grader modules, tasks manifest, verify script, unittest

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)

chore: stop tracking my-env clone; gitignore nested HF repo folder

Fix inference f-string + any other changes

Add GET / health JSON for HF Space root requests

Fix HF Space README: short_description under 60 chars

Deploy OpenEnv to Space

initial commit