Refactor agent architecture, improve heuristics logic, enhance parser robustness, simplify config, and optimize Docker setup for HF deployment

refactor: DRY weight updates, cache persona, O(1) discrimination, fix train run_episode bug, trim docstrings, inline imports

perf+fix: 24 issues — O(1) transcript cache, grader normalization, exhaustion turn matching, dossier DB loading, inline imports, neutral no-repeat, panel encapsulation

feat: Witness Stand — complete implementation

Initial commit: The Witness Stand project structure