Ambient Odyssey Worldgen Safety

Worldgen safety fixes for Tan's Huge Trees and Dungeon Crawl, plus a guarded Dungeon Difficulty retry.

**What it changes:** Three mixins: keep Tan's Huge Trees marker scheduling safe, persist Dungeon Crawl pending spawner NBT, and clean up Dungeon Crawl optional trades. If Dungeon Difficulty is installed, it retries its scaling safely. Requires Tan's Huge Trees 1.8.0 and Dungeon Crawl 2.3.17 exactly, because the mixins target their classes.

**Requires:** Minecraft 1.21.1, NeoForge 21.1.252+, Dungeon Crawl, Tan's Huge Trees.
**Environment:** Both (worldgen runs on the server; install on both).
**Credits:** Tan's Huge Trees and Dungeon Crawl by their respective authors; no code copied.
**Source:** https://github.com/alsynth/AmbientOdyssey (folder `addons/ao-worldgen-safety`).
**Licence:** MIT (full text below).

Made for the Ambient Odyssey modpack. Experimental: report problems at https://github.com/alsynth/AmbientOdyssey/issues.

NOT AN OFFICIAL MINECRAFT PRODUCT. NOT APPROVED BY OR ASSOCIATED WITH MOJANG OR MICROSOFT.

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