Oracles reference shared helper oracles (heightmap, level shape...) that
javac could not find when only the entry files were listed. Also let
chunkgen_bench list unsupported features (HORIZON_LIST_UNSUPPORTED=1).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Add registry-bound double-plant and moss placement, independent world RNG, survival ordering and post-write tick scheduling. Integrate named providers and feature graphs. Both pinned JARs matched 9,613,872 trace lines across 492,554 fixtures; workspace tests and all-target Clippy passed.