docs(scenario): structures pilot across five biomes

[gfargo]

Five more of the game's structures (one per biome) through the render, Pixelate, Birefnet, refine chain: 90 CU, every quote matched its bill.

• All seven native chains landed on the sprite's exact size at high confidence, 63 colours.
• Detail is far higher on the lodge, mill and plant, but each result is a different building, footprints drift up to 25%, Klein baked a ground patch under three of five (GPT did not), and the thin weather tower at 128 px came out noisy.
• Twice the grid (480 cells) worked as an image but only reached medium confidence.

Docs and benchmark README only. One sample per structure, judged by eye.

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Project	Deployment	Actions	Updated
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🎉 This PR is included in version 0.86.2 🎉

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