Biome Cleaner

Added

• Minecraft 26.1 support (Fabric + NeoForge): New targets for MC 26.1, which introduces a new versioning scheme, Java 25 requirement, and full deobfuscation.
• Forge 1.21.1 support: New target for Minecraft 1.21.1 on Forge.

Changed

• Reduced log noise (cleaner-mod): Removed [DIAG] diagnostic warnings that PreprocessManager emitted unconditionally on the tick thread. Rate-limited "Could not find biome holder" warnings in ChunkReplacementApplier to once per biome ID. Shutdown summary now labels the warming cache clearly, reports the noise pre-warm rate, and drops the redundant full-tier hit rate.

Fixed

• Warming path bypasses sampler mismatch correction (cleaner-mod, algorithm-core): The warming system builds its algorithm-core Chunk entirely from the flattened-sampler NoiseCache, so the existing PRE-STEP sampler-mismatch fix (which compares chunk palette vs noise cache) is a no-op on the warming path — both sides are the same source. When the interpolated sampler later fills the chunk palette with a different biome at a boundary quart, the prepared result has no replacement for it, and the fast path applies the result without correction, leaving a single-quart micro-biome island. Fix: PreparedChunkResult now carries an originalBiomes snapshot of what the warming worker observed. The fast path in CleanerProcessor compares this snapshot against the palette for each quart; on mismatch, it overrides the noise cache entry and re-processes just that quart via the new ChunkCleanupEngine.processMismatchedQuart() (stability cache skipped), merging any replacement into the prepared result before applying. Unaffected quarts keep their warming-computed replacements.