Custom Ore Gen

# Custom Ore Gen — 4.1

A hotfix release that removes developer-only diagnostics that could destabilise dedicated servers. **No gameplay changes** — all ore generation, the Diamond Shard tier, the Deep Dark lock and mod compatibility are identical to 4.0.

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## 🐛 Bug Fixes

*   **Removed world/server-corrupting code** — Three developer-only diagnostic classes were accidentally shipped in 4.0. They have been removed entirely:
    *   `OreAuditHandler` — contained a hard-kill that would terminate the server process, and forced chunk generation from a separate thread (a classic cause of chunk corruption).
    *   `SpawnRelocator` — forced synchronous chunk generation on the main server thread during startup, causing deadlocks and hang.
    *   `GenerationStabilityTest` — a GameTest utility that had no place in a release build.
*   None of these classes were referenced by any gameplay code; removing them has **zero impact** on how the mod plays.

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## 🔄 Changes

*   Spawn-point behaviour reverts to vanilla (the removed `SpawnRelocator` no longer moves the spawn). Since the temperate band is 16,000 blocks wide, the vast majority of spawns still land in a balanced ore zone.

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## ✅ Verification

*   No `System.exit`, `Runtime.halt`, forced chunk loading (`getChunkAt`/`getChunk`), manual threads or `setBlock` calls remain anywhere in the codebase.
*   Build and unit tests pass.

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**Full build:** Minecraft 1.21.1 · NeoForge 21.1.x · Lithosphere 1.7+ (required)