C1 (Tyre): the DeriveWindow branch re-ran the ~45ms run_layer1 for
EVERY uncached window — the dominant pan-around-one-body path paid
~52ms per new window while the doc claimed one-time-per-body.
TerrainAnalysisCache: private per-body LRU (capacity 8, ~2MB/entry,
true access-recency eviction — which body the player keeps panning IS
a recency signal) held as Arc<Mutex<>> on GenerationQueue itself, the
in_flight field pattern, because run_work_item executes on a Rayon
worker where the main-thread caches are unreachable. DeriveWindow now
calls get_or_derive; the variant doc states the real model (first
window per body pays ~45ms once; subsequent windows any center/n hit
the LRU; eviction re-pays). End-to-end test proves two windows on one
body via two connections share exactly one cache entry.
C3 (Tyre): the determinism test reused one TerrainAnalysis — proving
the packer, not the derivation. New test runs run_layer1 twice
independently, asserts field-by-field analysis agreement, then
byte-identical packed windows end to end (D-227 save-critical proof).
Packer-only test kept alongside.
atlas:: 564/564; full lib 1778/1778; timing-sensitive suites 3x stable.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
jpmschweitzerandClaude Fable 5
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