docs(mystery): implementation plan for engine prereqs
17 tasks covering type widening, theme removal, parser stop-words + ambiguous + verb-target-prep variants, dispatcher handlers for read/light/extinguish/use, ending detection, and UI ending screen. Includes self-contained locked-exit fixture and manual playthrough. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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