screenshots: adopt stable-named shots (belong on main, off gameplay branch)

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The stable-named screenshot set (renamed in the NPC/character work) is
review content that does not belong on the gameplay-crossing branch. Bring it
onto main directly:

- renames all 9 numbered review shots to stable camera names
  (review-overview, review-character, ... review-hero-facade-oblique)
- adds the download-north-buildings demo shot + review-npc-prefab
- README updated for stable naming and the new NPC shot

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