Worldgen Phase 1: tune mountain biome terrain modifiers

[MichaelFisher1997]

Parent: #646

Phase

Phase 1: Terrain modifier integration

Goal

Make mountain-family biomes structurally distinct across meadows, groves, slopes, and peaks.

Tasks

• Tune mountains, snowy_mountains, meadow, grove, snowy_slopes, jagged_peaks, frozen_peaks, and stony_peaks modifiers.
• Ensure peak compression still prevents extreme spikes.
• Improve altitude/slope identity for mountain sub-biomes.
• Add tests or baseline comparisons for high-elevation distribution.

Acceptance Criteria

• Peak biomes are meaningfully higher/rougher than lowland biomes.
• Meadows/groves appear as transition bands rather than random lowland patches.
• LOD height output does not create obvious seams around mountains.

Dependencies

• Requires terrain modifier integration.

Parallelization

Can run in parallel with wetland and dry-biome tuning after integration.

[github-actions]

This is a feature request to tune mountain biome terrain modifiers in the world generation system. The task list contains several placeholder emoji markers (□, ◆, △, ▣, ◉, ◎, ⬡, ✧) which don't render the actual modifier names. Could you clarify which specific terrain modifiers need to be tuned for Phase 1? A list like surface_noise, mountain_height, slope_factor, peak_compression, etc. would help identify the exact code locations to review. Without knowing the specific modifier names, I can't provide targeted analysis of how they currently work or suggest concrete tuning approaches.

That said, the acceptance criteria are well-defined:

• Peak biomes should be higher/ rougher than lowlands
• Meadows/groves should appear as transition bands (not random patches)
• LOD height output should not create seams around mountains

One architectural note: since this is part of a multi-phase effort and depends on terrain modifier integration from the parent issue, I'd suggest confirming whether that parent work is complete before beginning Phase 1, to avoid potential rework if the modifier system changes significantly.

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