Fix: clamp scores to strict (0.001, 0.999) — validator rejects exact 0 and 1

Audit fixes: tests/ dir, clean imports, reactive corpus, README polish

Staff-Level Upgrade: Segmented Evaluation, Noise Filtering, and Task Hardening

Implement profound exploit hardening (InstructionGuard, DensityCheck, LogicalAlignment, Step-Locking)

Apply bug fixes over Grader logic per evaluation guidelines

Enhance: Upgrade test suite to professional simulation showing clear reward shaping

Fix grading keys mismatch: allow actual dataset metrics to be graded

hackathon: final submission candidate (removes binary image for HF compatibility)

Fix imports for flat deployment structure in HF Spaces

Initial commit of PolicyEvolverEnv - Meta Hackathon