The plugin had ZERO stat counters, so every claim this refactor makes was
harness-only: "skipped correctly" and "skipped nothing" render identically.
CODEX-TASK-001 and -002, executed by Codex (gpt-5.6-luna xhigh), reviewed
against the source.
Eight DWORD counters in a new stat group:
GenerateTileResult -- TilesClassified / SkippedAllSolid / SkippedAllAir / Meshed
ClassifyTile bAnyCave exit -- TilesOpStackSolid / TilesOpStackAir
FSurfaceColumnSource::GetColumn -- ColumnMemoHit / ColumnMemoMiss
The op-stack counters are separate from the lumped skip counters on purpose:
ClassifyTile also proves AllSolid on its hand-written bedrock-gap path with no
strate opted in, so the lumped number cannot show a before/after. The op-stack
pair is zero BY CONSTRUCTION until a strate ticks the flag.
GetColumn is instrumented and deliberately NOT fixed -- the instrument and the
fix in one build would make each other unreadable.
Verified against UE_5.7 Stats.h rather than assumed (first stats use in this
plugin, no in-repo precedent): all four macro arities, and INC_DWORD_STAT ->
FThreadStats::AddMessage, so the worker-thread safety both sites need holds by
mechanism. Not built -- Jahni builds.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Fr0zka
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