v0.1.0 — foundations

First release. End-to-end proof of the live data pipeline (Phase 0 spike) plus the Phase 1 scaffold: source-agnostic core, first game adapter (League of Legends), frame-diff event engine, async SQLAlchemy models, asyncio pollers and a FastAPI REST API. Multi-game by design — see ROADMAP.md. Details in CHANGELOG.md.