Fix G06 500 error: call env.reset() on session creation to init hidden state

Add cell_errors, error_regions, common_error_patterns to submit_rule response

Fix submit_rule: random eval seed + held-out validation set

Deploy Discovery Environment API + Dashboard with agent run logs

Make simulate endpoint robust to all state_json formats

Fix scoring: use cell-level partial credit instead of binary exact-state match

Deploy Discovery Environment API