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Add diagnostic logging to task_registry for validator discovery debugging

Register all 7 tasks in task_registry with wrapped graders

Dual-interface compatibility: graders return float for validator, environment converts to tuple internally

Critical: fix grader wrapper to return tuple (reward, error_msg, bugs_fixed) with clamped reward

Fix: implement grader wrapper API with float returns and strict (0.001, 0.999) bounds

Fix: limit task registry to 3 validated graded tasks (JSON, YAML, Dockerfile)

Replace repo with updated config-debug files