key-pool rotation: per-session OpenAI key assignment from OPENAI_KEY_01..10 (core/config_loader.py)

Initial deploy of C (non-ca): no post-essay chat. Stripped chat additions from answer-ca base.

B condition: add post-essay general chat. After perfect_answer is shown, msg_input + send_btn become interactive; on_send builds messages from case + initial_argument + perfect_answer (NOT discussion_plan) and calls LLM. Logs each chat turn via SessionLogger.add_turn(manager_verdict=None).

Deploy: no_ai control bot — chapters TOC + essay logging

Deploy: no_ai control bot — chapters TOC + essay logging