diff --git a/docs/research/2026-09-01-overhaul/s5-consumers-material-closeout-packet.md b/docs/research/2026-09-01-overhaul/s5-consumers-material-closeout-packet.md
index 32acc50d..e77c0f83 100644
--- a/docs/research/2026-09-01-overhaul/s5-consumers-material-closeout-packet.md
+++ b/docs/research/2026-09-01-overhaul/s5-consumers-material-closeout-packet.md
@@ -328,3 +328,35 @@ Independent mutation ledger (each mutation restored exactly before the next):
    `ApplyRetailView_UsesOwnerVisibilityAndInclusiveAuthoredDistance` first
    failed `Assert.True`, expected true / actual false, at
    `ParticleSystemTests.cs:519`.
+
+## 10. Sequential review 1 — retail lens and fix round 1
+
+The retail lens found **no behavioral retail-fidelity defect**. It independently
+matched the paired executable/PDB identity and bytes for
+`ShouldDrawParticles`, `UpdateParticles`, both cell-family virtuals, the
+previous-completed-frame transaction, the low-word discriminator, examination
+bypass, x87 distance edges, AP-116, the exact landscape handoff, and unchanged
+particle draw/queue/tick behavior. The lens returned FAIL on comment truth only:
+
+1. `ParticleVisibilityController.UseWorldView` still says an outdoor fallback
+   can publish the authoritative product, although S5-c1 deleted it.
+2. `WalkFrameDriver.CopyVisibleCellsTo` still calls the diagnostics union the
+   complete `CObjCell::IsInView` answer and says particles, lights, and shadows
+   consume it. Particles now consume only the landscape half, EnvCell particle
+   eligibility is constant true, point lights use the resident registry, and
+   directional shadows remain S5-c2.
+3. `ParticleSystem` calls the sorted-list lifecycle insertion/removal cost
+   binary even though only the insertion search is binary and list shifts /
+   removal are linear. Its adjacent blanket `O(log E)` lifecycle sentence must
+   remain scoped to the `SortedSet` indexes rather than the new list.
+
+Fix round 1 is comment-only. It may change exactly
+`ParticleVisibilityController.cs`, `WalkFrameDriver.cs`, and
+`ParticleSystem.cs`, plus this packet's result section. Do not change behavior,
+tests, register rows, architecture prose, or any other file. Correct the three
+descriptions to the surviving ownership/cost model, run `git diff --check` and
+the same focused retail-review classes (47 Core particle tests, 38 App
+visibility/terrain/frame/renderer tests, and 3 AP-116 settings/live-object
+tests), commit once, then return to a narrow retail comment-truth re-review.
+The production/gate-honesty lens remains undispatched until that re-review
+passes. A third fix round still stops the chunk.