feat(media): introduce MediaRouter and stubs for image and speech generation

Merge remote-tracking branch 'origin/main' into worktree-scenarios

feat: make every scenario arena-grade with a competition contract

feat: Implement well-known typed fields for verdicts in output models

feat: require live infrastructure for event store and inference, removing offline mode

feat(observability): add Gradio Telemetry panel (Unit 9)

feat(observability): instrument registry, tools, session, modal (Units 7,8,10,11)

feat: add Hugging Face inference backend next to Modal

feat: Enhance model routing and deployment flexibility

feat: unify model catalogue and self-hosted routing

feat: mem0 as a layered, derived semantic memory index

feat: LiteLLM gateway routing profiles to Modal-served small models

Refactor code structure for improved readability and maintainability