feat: update agent personas and scheduling in YAML configurations; enhance event handling and memory deduplication in core logic

feat(observability): instrument models, conductor, memory, ledger (Units 2-6)

feat: add Hugging Face inference backend next to Modal

feat: implement streaming agent responses and enhance conversation flow with repeat guards

feat: unify model catalogue and self-hosted routing

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

feat: update setup instructions and dependencies for uv integration

Refactor code structure for improved readability and maintainability

feat: phase 1 — memory layer, governor, second scenario, 70 passing tests