chore(root): scaffold monorepo — Phase 0 complete

README.md

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+# @paratype
+
+A Doorenbos-style Rete II rules engine for TypeScript games, with an authoritative WebSocket chess demo.
+
+## Packages
+
+- [`packages/rete`](packages/rete) — Rete II engine core
+- [`packages/chess`](packages/chess) — Browser chess demo (React + Vite)
+- [`packages/server`](packages/server) — Authoritative Bun WebSocket server
+
+## Docs
+
+- [SPEC.md](packages/rete/SPEC.md) — Engine specification
+- [PHASES.md](docs/PHASES.md) — Development phases & perf budgets
+- [RULES.md](packages/chess/RULES.md) — Chess rule presets
+- [PROTOCOL.md](packages/server/PROTOCOL.md) — WebSocket message protocol
+
+## Getting Started
+
+```bash
+bun install && bun run check
+```