Retail owns every frame decision (rooting, PView, cone gating, landscape
walk, buildings, stage interleave, depth semantics, degrade, particles,
camera incl. zoom envelope); modern code owns only pixel-neutral GPU
mechanics. Replaces the ~4.7K-line accumulated visibility layer with the
ported walk; keeps the WB-derived asset pipeline. Gated by a cdb walk
oracle, a standing transition checklist, and an early dense-town perf
checkpoint. Staged W0-W6 with no long-lived dual path.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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