Add session checkpoint: v3 launch decision with full context

apply v3 task-aware thinking controls and delete deprecated notebook

Add v3 thinking control patch - task-aware system prompts + think efficiency reward

Initial commit: Tucano2-Commerce GRPO v3 training pipeline

Upload grpo_vertex_v3.ipynb

Rename notebooks/grpo_vertex_v3.ipynb to notebooks/DEPRECATED_grpo_vertex_v3.ipynb

Delete grpo_vertex_v3.md

tools: add md-to-ipynb converter script

feat: add v3 notebook (.ipynb) — ready for Vertex AI Workbench

feat: add GRPO v3 implementation with entropy collapse fixes

Create grpo_vertex_v2_ipynb.md

docs: add ADR-001 next steps with detailed execution plans

docs: add project documentation

initial commit