fix(OpenEnv): fix rounding bug in inference.py log and ensure safe [0.1, 0.9] interior scores

fix: increase score precision to 4 decimal places in inference.py to resolve validation out-of-range errors

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

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

fix(OpenEnv): remove bonus task and refine ranges to ensure absolute strictly (0, 1) compliance across all fields

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

fix: remove all 0.00/1.00 edge cases from inference output

fix(grader): clamp all scores to [0.01,0.99] and revert inference to :.2f format

fix(inference): use 4dp score format in [END] line to preserve strict (0,1) precision

fix: remove HF_TOKEN default from inference.py for OpenEnv spec

fix: add FastAPI REST endpoints for OpenEnv validator