Delete training/GRPO_Training_Submission.ipynb

Replace GRPO notebook with final Qwen version, remove redundant files

Sanitize empty finding descriptions

Harden reward parsing for truncated JSON

Add clean GRPO training submission notebook

Add Colab training scripts and env-tunable GRPO config

Round2 hardening, campaign fixes, training quickstart, and CI gate

Round 2 Implementation: Multi-period campaign, regulatory shocks, adversarial grading, and GRPO training infrastructure