Condensed 14-room manor on one spine (restore power -> escape) stacking all five
mechanics, plus an optional spirit thread feeding 3 priority endings (no
hard-fail). Pure YAML content on existing engines. Consolidates to one world
(removes the toy test fixture) + a WorldSolvableTest that walks the critical path.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
