Maximize environment: curriculum task, metrics endpoint, 5 bug fixes, notebook fix

Implement all audit fixes: base class, curves, README, code quality

Fix /web 404: guard matplotlib import and harden Gradio mount

Auto-seed Regulator tracker on startup — pipeline demo works immediately on cold start

Add Generator adversarial GRPO training + /generator/score endpoint

Add 3 novelty upgrades: predictive Regulator, compound fraud, confidence calibration

Add multi-agent architecture: Regulator, biased Generator, Auditor rewards

Add Gradio web UI mounted at /web for interactive agent testing

Add WebSocket /ws endpoint required by openenv-core GenericEnvClient

Add adversarial, negotiate, supply_chain tasks + dynamic difficulty + richer rewards

Fix concurrent state conflicts with session-based environment registry

Fix openenv validate issues

Add full invoice processing pipeline environment