docs(scenario): flat-prompt backdrops reach the game's exact grid

[gfargo]

Follow-up to the game pilot (#250). Two of the game's 256x112 backdrops (alpine ridge, swamp treeline) re-run with a flat, front-facing prompt, 44 CU, every quote matched its bill.

• The isometric prompt came back on a diagonal plane. Removing its isometric wording and asking for a flat side-on elevation strip, "NOT isometric", base line horizontal, gave horizontal bands.
• Finals are the exact 256x112 grid at high confidence, 45 to 47 colours.
• A 1 CU Klein render gave a cleaner single massif than the 11 CU GPT one.
• Weak spot recorded: Birefnet leaves a speckled fringe where a form fades into the white background.

Docs and benchmark README only; the prompt is in SCENARIO.md. One sample per backdrop.

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