fix(OpenEnv): implement system-wide [0.1, 0.9] boundary scrub for Phase 2 compliance

fix(OpenEnv): global overhaul to high-resolution interior clamping (0.001-0.999) per technical diagnosis

fix(OpenEnv): restore missing positional arguments to _build_observation calls (regression fix)

fix(OpenEnv): implement robust grader bridge and strict interior clamping [0.1, 0.9] to satisfy Phase 2 validator

fix(OpenEnv): final scour of zero/one values from rewards and state to ensure absolute compliance

fix(OpenEnv): global overhaul to ensure every sub-score, reward, and model default is strictly within (0.01, 0.99) to satisfy Phase 2 validation

fix(OpenEnv): ensure all scores and rewards are strictly within (0, 1) and non-negative to satisfy Phase 2 validator

fix: add FastAPI REST endpoints for OpenEnv validator