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### Direction Next: session 4 of the walkability cache — replace vanilla's per-node `getBlockState` calls inside `PathFinder` with reads from the Rust section store. The parity gate from 0.6.4-alpha gates that swap. ## [0.6.4-alpha] — 2026-05-17 ### Added - **Dispatcher latency probe** (`/ferrite probe dispatcher on`, default off). Captures queue-wait per priority lane and per-task wall time on the worldgen and light executors. Measurement on fast-flight load: task body is 4-10x the dispatcher's worst tail, so the dispatcher is not the bottleneck. Probe stays in tree for re-measurement under other workloads. - **Walkability cache infrastructure (sessions 1-3).** Block-kind cache for the pathfinding subsystem: Rust section store (4096-cell flat arrays, evict on block change), JNI surface, Java bridge with 18-category block classifier, lazy section fill on path requests, and a parity gate that validates cache predictions against vanilla's node evaluator. Parity result: 6 critical mismatches out of hundreds of nodes checked per session (all structural 2-block-model limits). The performance swap (session 4) is the follow-on. ### Removed - Dead `SurfaceValidator.onServerTick` method and its fields (zero callers). ### Internal - Threading audit (`docs/COMPATIBILITY.md`): three-tier safety classification of every non-final static field on worldgen and entity-tick paths, plus Rust-side concurrency posture (zero unsafe statics, zero plain cells). - Doc index (`docs/DOC_MAP.md`) and various doc updates across JOURNEY, FUTURE_PLANS, and per-subsystem writeups.