feat: add QuestCore game editor scaffold with codegen and parser

[amirna2]

Summary

Adds the QuestCore game editor as a SvelteKit web app in tools/editor/. This PR covers the design doc and Phase 1 implementation: the TypeScript data model, Lua code generation, and Lua import parser — the full round-trip contract between .lua files and the editor's typed model.

Purpose

The editor will let game authors visually create QuestCore games without knowing Lua. This PR proves the foundational contract: we can parse existing .lua game files into a TypeScript model and re-export them as clean Lua. All subsequent UI work (Phases 2-5) builds on this.

What's included:

• docs/design/editor-design.md — Full technical design document
• TypeScript data model (export types + editor wrapper types + factory functions)
• Lua codegen: model → .lua for all content types (game, rooms, items, NPCs, enemies, rules, events)
• Lua parser: .lua → luaparse AST → walker → table evaluator → typed model
• Round-trip test: imports all Lost Crown .lua files, re-exports them, and verifies correctness
• 63 passing tests across 7 test files

Tests Performed

• npm test — 63 unit tests covering:
  • All 10 condition types and 16 effect types (codegen)
  • Room, entity, rule, event code generation
  • AST walker declaration extraction
  • Table evaluator (records, arrays, helper calls)
  • Full Lost Crown round-trip (import → model → export)
• npm run check — zero TypeScript/Svelte errors
• npm run build — production build succeeds

Tests Not Performed

• make ci — Go CI pipeline doesn't cover the tools/editor/ directory (separate Node.js project)
• E2E tests — no UI yet (Phase 2)
• No editor CI job exists yet — will be added when UI is built

CI Checks

• make ci passes locally

AI Assisted

• Yes
• No

🤖 Generated with Claude Code