sync: pull latest from main (model_server.py, captain LLM toggle in ui.py, 0.6B configs, SUBMISSION + RUNTIME_DURABILITY docs)

sync: today's source updates (XML-only prompt, reward unclip, neg-reward on loss, pinned versions, configs reorg)

feat: add field-aware hybrid ball simulation and timing logs

fix: preserve match outcome reward objective

docs: clarify HF Gemma runs and OpenEnv traces

docs: explain adaptive benchmark architecture