Port OreSpawn 4.0.9 to Forge 1.15.2

[SkyBlade1978]

Summary

• preserves all long Ore and Fluid editor host, tag, and biome-list values when reopening and saving profiles
• modernizes the Forge 1.15.2 build and release tooling to ForgeGradle 7 / Gradle 9.6.1 while retaining Forge 31, Java 8 bytecode, reobfuscation, and the existing API/schema contracts
• adds deterministic release artifacts, artifact audits, Buildship launches, pinned CI, wrapper validation, CodeQL, and complete documentation export
• fixes Residual vanilla Dirt survives total-conversion terrain replacement #255 for Forge 1.15.2 by running the existing single geology replacement pass after raw terrain but before provider surfaces and later authored features

The #255 fix reuses the existing terrain_dimensions.host_blocks contract. It preserves later structure/vegetation blocks, bedrock, fluids, block entities, and existing chunks. The issue remains open while other Minecraft branches are qualified independently.

Validation

• user-tested in Eclipse and accepted at commit 110e942
• 120 tests across 31 suites, with no failures, errors, or skips
• full normal and cold ForgeGradle 7 build, Javadoc, artifact, checksum, and Eclipse gates
• exact reobfuscated Forge 31 packaged fresh/reload server and client runs with clean logs
• fresh/reload Residual vanilla Dirt survives total-conversion terrain replacement #255 probe covering declared dirt, sand, clay, terracotta, cave, underwater, late-feature, bedrock, fluid, and block-entity cases
• matched worldgen comparison: +1.05% direct and -4.35% control-normalized Sky time
• hosted build/audit, Gradle-wrapper validation, and CodeQL all passed on the exact head SHA

Compatibility

Version: 4.0.9.115021. API major 1 and provider/global/world schemas 4/6/5 are unchanged. No provider JSON, profile, migration, registry, or save contract changes are introduced; already-generated chunks are not rewritten.