[nico2525nn]

Summary

• Group each dimension's world, block entities, light/fluid/redstone/block-tick services, persistence, and local dispenser/detector-rail state in GameServer::DimensionRuntime.
• Route dimension-local state through the same canonical 0/-1/1 runtime selector and preserve Overworld/Nether/End iteration order.
• Update the public architecture overview and internal state/development references without changing the compatibility matrix.

Verification

• Timeout-wrapped cmake build of build-dimension-runtime: PASS; final incremental invocation reported no work to do.
• Full non-nightly, non-package CTest: 55/55 PASS in 530.73s on source commit c56c4f0, before the documentation-only commit b092238.
• After the documentation update, jvm_contract_audit, quality_audit, and tautology_lint: 3/3 PASS.
• git diff --check: PASS. Post-suite process check found no remaining cppfm server process.

Review and limitations

• Two independent reviews of the final PR head found no additional actionable issues. Both verified the canonical 0/-1/1 selection, dimension iteration order, and accuracy of the documentation.
• This is an ownership step, not a completed lifecycle component: service construction and callback wiring remain in GameServer::init(), and service pointers are nullable before initialization.
• No gameplay behavior, MISSING status, or compatibility claim is promoted. Mineflayer testing remains deferred until the broader code-quality refactor gate is met.
• GitHub Actions must pass on this exact PR head before merge.