machina.js v6: TypeScript rewrite with monorepo structure

[ifandelse]

Summary

Complete rewrite of machina.js for v6. The JavaScript source (src/, lib/, spec/) has been replaced with a TypeScript implementation under a pnpm monorepo structure.

What changed:

• Core library (packages/machina/): Full TypeScript rewrite of BehavioralFsm, Fsm, emitter, and utilities. New typed API surface with createFsm and createBehavioralFsm factory functions alongside class exports. Comprehensive test suite (~4K lines across 3 test files).
• Documentation (packages/docs/): Astro/Starlight docs site covering concepts, guides, migration (v5→v6), and example walkthroughs. GitHub Actions workflow for deployment.
• Example apps (examples/): Five demo apps — connectivity monitor, dungeon critters game, shopping cart, traffic intersection, and a React checkout flow — each with their own FSM configs, tests, and Vite builds.
• Infrastructure: Moved to pnpm workspaces + Turborepo. Old v5 code archived. Root-level build configs (webpack, karma, gulp) removed. New tooling: tsup for library builds, Jest for testing, ESLint + Prettier for formatting.

What was removed:

• Pre-v6 source, specs, build tooling, Bower config, and example apps moved to archive or deleted.
• Old package-lock.json replaced by pnpm-lock.yaml.

Test Plan

pnpm install && pnpm test

Pre-submission Checks

General Checks

• ✅ New environment variables
• ✅ Dead code
• ✅ Leftover debugging
• ✅ Breaking interface changes
• ✅ Large binary/asset additions

React & Frontend Checks

• 🤷 Missing data-cy — acceptable for demo
• ✅ One public component per file
• ✅ No direct component tests
• ✅ BEM class naming
• ✅ Missing key on dynamic lists
• ✅ Direct DOM manipulation
• ✅ Derived state anti-pattern
• 🤷 Hardcoded strings — acceptable for demo
• 🤷 Missing error boundaries — acceptable for demo
• ✅ Prop drilling
• ✅ Non-memoized context values
• ✅ useEffect missing cleanup

Unit Test Checks

• ✅ Critical Rule 1
• ✅ Critical Rule 2
• ✅ No testing style hooks
• ✅ No testing barrel exports
• ✅ Missing export default {}