feat(ecs): parallel system execution with rayon thread pool#155
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Rayon will be used for parallel ECS system dispatch during the SIMULATE phase. Added as a workspace dependency and wired into basalt-ecs and basalt-server.
Add dependency graph scheduler and parallel dispatch for the SIMULATE phase. Non-conflicting systems run concurrently via rayon; conflicting systems are serialized into sequential groups. Key components: - schedule.rs: greedy graph coloring from SystemAccess declarations, with GroupCache precomputed at startup (LCM-based cycle, O(1) lookup) - parallel.rs: ParallelSystemContext using store partitioning — write-stores as exclusive ownership, read-stores as shared refs - ecs.rs: run_phase_parallel with fast path for single-system groups, zero per-tick allocation via Vec<Option<SystemDescriptor>> storage Spawn/despawn during parallel execution is deferred and applied between groups. The SystemContext trait and all plugin APIs are unchanged.
Initialize the rayon global thread pool at server startup with a configurable thread count (system_threads in [server.performance]). Add missing component access declarations on core systems (lifetime, pickup_delay) so the parallel scheduler can compute correct groups.
Three nightly benchmarks for regression detection: - fast path (single system, zero overhead baseline) - 3 non-conflicting systems (rayon parallel dispatch) - 2 conflicting systems (sequential fallback in separate groups)
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Summary
system_threadsin[server.performance])Vec<Option<SystemDescriptor>>storage and cache take/put-back patternCloses #123
Test plan
-D warnings)cargo +nightly bench -p basalt-ecsto establish baseline for parallel_fast_path, parallel_3_non_conflicting, parallel_2_conflicting