Phase 13 Stage 1 v2: fix termination signal - reward penalties for non-termination, reduced max_tokens, stop_strings

Phase 13 Stage 1: pivot to winner's pattern - TRL 0.29.0 + fast_inference=False + DAPO loss

Phase 13 Stage 1: fix Unicode encoding artifacts in notebook comments

Phase 13 Stage 1: drop vLLM, use Kaggle native torch 2.10, upgrade trl to 0.18+ (Kaggle dep compatibility)

Phase 13 Stage 1: apply all 7 notebook audit fixes (account labels + health check + hub namespace + explicit commenting)

Phase 13 Stage 1 prep: Kaggle runbook + Run 1 config pre-populated (notebook audit flags pending approval)

Phase 8: Env client + GRPO training skeleton (Kaggle notebook)

first commit