14-task plan covering: gray-matter+zod setup, schemas, four pure
parsers (room/item/ending/encounter), narration() helper with
auto-registration, one-shot migration script, round-trip
verification, world assembly cutover, encounters.ts refactor,
manual playthrough, and Obsidian vault config.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
