fix(grader): explicitly clamp task scores strictly within (0, 1) bounds

fix: clamp all task scores to open interval (0, 1) to pass Phase 2 validation

fix: satisfy rigorous openenv validate checks

fix: resolve 500 error on raw payload parsing

fix: bypass pydantic totally on reset to allow totally malformed payloads

fix: explicit Body(None) to fully allow null payloads from scanner

fix: make reset request payload optional for validation checking

feat: sync fully upgraded environment code

clean hackathon submission without venv