Fr0zka
4ba53f2ede
Part B paid for itself on its first flight. Over the caves, Tiles Classified == Tiles Meshed (nothing skipped at all) and CaveBailNotOpStack accounts for ~80% of cave-branch attempts. That counter has exactly one cause: UsesOperatorStackForChunk returned false -- so either the strate flown over has not ticked bUseOperatorStack, or a chunk in the tile's box belongs to an adjacent strate that has not, since the per-chunk sweep requires every chunk to agree. CaveBailStackVerdict being non-zero (0.32) corroborates: where the flag did hold for the whole box, the stack built fine and merely returned Mixed. The machinery works; it is mostly not being reached. RETRACTION: I called the column-memo port a regression after comparing 14.7% from one flight against 23.3% from another. Invalid -- the miss rate is strongly location-dependent (~10-30%) and was in that band before the port. Comparing single-flight averages from different routes measures the route. A real before/after needs the same seed and route; parked until then, and not urgent. Kept while diagnosing: GSurfColCache is a 6-box LRU, not one box. My spec said "a direct-indexed box" and Codex implemented one faithfully, so any recentre now wipes all 6561 cells where the old table lost one entry. Plausible thrash source, unmeasured. Port the LRU if the memo is revisited. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>