chore(release): v2026.8.3 changelog + What's new feed

[marceld23]

Changelog-first release PR for v2026.8.3 ("the wonders release").

• CHANGELOG.md: new [2026.8.3] section — terrain wonders (feat(worldgen): wrap-around mega-rift — a canyon girdling the entire planet #698–feat(worldgen): carver consumers — lava tubes, cave mouths, river incision, crevasses #709, perf(worldgen): cache per-world feature gates — SurfaceHeight got ~2.6x slower with the terrain wonders #712), continents (new worlds only, feat(worldgen): continents & real oceans on large planets (new worlds only) #704), combat: enemy health bars / crosshair aiming / AutoAim world rule / ship-weapon enforcement (Floating health bars above enemies (planet + space, toggleable) #692–Ship weapons: server ignores cooldown & energy; client hardcodes range 45 #694), biome-pool shuffle (Worldgen: multi-biome worlds always use the first N biomes of their pool - subset is never shuffled #696), NPC grounding + appearance (NPCs float above the ground, look uniformly dark, and all look identical #711).
• data/whatsnew.json: re-exported via tools/devblog/export_whatsnew.py — 21 posts, now including the 2026.8.3 release post (DE+EN). WhatsNewContentTests 3/3 green locally.

Tag v2026.8.3 will be cut on the merge commit.

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