Add Minecraft Java Edition 1.21.5–1.21.11 support

[Copilot]

Cubiomes had a MC_1_21_WD placeholder for the "Winter Drop" update (now released as 1.21.4), and no support for 1.21.5–1.21.11. The key behavioural change in 1.21.5+ is that Pale Garden biomes generate more frequently and over a wider weirdness range.

Version enum (biomes.h)

• Renamed placeholder: MC_1_21_WD → MC_1_21_4 (alias MC_1_21_WD kept for backwards compat)
• Added MC_1_21_5 and MC_1_21_11 = MC_1_21_5 (1.21.5–1.21.11 share the same biome tree)
• MC_1_21 and MC_NEWEST now point to MC_1_21_5

MC_1_21_4,                   // 1.21.4 Winter Drop
MC_1_21_WD = MC_1_21_4,      // backwards compatibility alias
MC_1_21_5,
MC_1_21_11 = MC_1_21_5,      // 1.21.5–1.21.11 share the same biome generation
MC_1_21 = MC_1_21_5,
MC_NEWEST = MC_1_21,

New biome tree (tables/btree215.h)

New binary-encoded biome parameter search tree for 1.21.5+, derived from the official Minecraft data generator (1.21.11.jar). Pale Garden has an unrestricted weirdness range vs. the [2666, IMAX] constraint in 1.21.4.

Biome tree selection (biomenoise.c)

climateToBiome() now selects btree215 for mc >= MC_1_21_5, falling through to btree21wd for 1.21.4:

if (mc >= MC_1_21_5)
    bt = &btree215;
else if (mc >= MC_1_21_WD)
    bt = &btree21wd;

Biome parameter limits (finders.c)

Added g_biome_para_range_215_diff with the expanded Pale Garden weirdness range (IMIN, IMAX instead of 2666, IMAX). getBiomeParaLimits() checks this table first for mc > MC_1_21_WD.

Version string handling (util.c)

• mc2str(MC_1_21_5) → "1.21.11" (reports newest patch in the range)
• str2mc() accepts "1.21.11", "1.21.5", "1.21.4", and "1.21 WD"

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• en.wikipedia.org
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (dns block)
• minecraft.fandom.com
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (dns block)
• minecraft.wiki
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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