docs(mystery): implementation plan for markdown content migration
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>
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