Defense-in-depth apparatus per the 2026-05-27 handoff's option-1 recommendation.
The audit-found pool aliasing bug (prior commit) is the primary fix; this probe
is the safety net for any unidentified residual issue when the visual gate runs.
EmitDrawOrderProbe now logs the full GL state at each step boundary of
RenderInsideOutAcdream — stencil test/func/ref/mask/op, depth func/mask, cull
face/mode, blend src/dst, color writemask, current VAO, current program. An
operator can read the log offline and compare line-by-line against WB's
expected state at VisibilityManager.cs:73-239. Any divergence pinpoints the
bug's GL-state shape; matching state confirms the issue is elsewhere
(instance data, mesh upload, etc.).
EmitEnvCellProbe now logs pool diagnostics — total pool size + snapshot's
PostPreparePoolIndex high-water mark. A spike in poolTotal across stationary-
camera frames, or a divergence between poolHwm and cell-count, signals
pool-management regression. The fix-the-bug-first principle keeps this probe
dormant by default; enable via ACDREAM_PROBE_VIS=1 only when investigating.
Heavy (~10 GL queries per step × 5-10 steps per frame), but gated.
86/86 App tests still pass.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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