[oglassdev]

Stacked on #336 (→ #335 → #334).

Summary

Chunk no longer converts Anvil saves into .polar worlds at build time. The converter added in #336 bridged upstream Minestom and multistom with reflection; rather than ship that, world conversion is removed until it can be designed properly. .polar worlds are unchanged.

• SDK: WorldOptions is just { source }, a .polar file. The chunks cropping option is gone.
• chunk-build: a world whose source isn't a .polar file fails with world <name> must be a .polar file; Chunk no longer converts Anvil saves, including when chunk inspect runs before the file exists. WorldFormat, chunk ranges and the converted-world build path are removed. chunk inspect worlds are now { "source": "<path>.polar" }.
• chunk-cli: the asset plan's Anvil branch is removed.
• Gradle plugin: the convertChunkWorld_* tasks and chunk inspect's Anvil parsing are removed, so the plugin no longer reads worlds at all.
• jvm/world-converter: removed, along with docs and distribution entries.

Breaking changes

• Point each world's source at a .polar file. Convert Anvil saves with your own tooling for now.

Validation

• cargo test -p chunk-build project / assets, cargo test -p chunk-cli assets, cargo clippy -p chunk-build -p chunk-cli --all-targets
• jvm/gradle-plugin tests
• examples/{arena,local,load} testClasses; arena still packages its .polar worlds
• SDK typecheck (tsc -p crates/chunk-build/sdk)
• just fmt-check

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