probe(render): [dyn-route] DynamicLast admission trace + rain PASS note

The owner''s through-wall remote-player report (standing in 0xF4180101,
a player parented at 0xF4180112 - the south hall, geometrically
unseeable through the cathedral - renders through opaque walls; from
0xF4180104 he is correctly hidden). The DynamicLast admission chain
has three gates (indoor / old-apparatus look-in exclusion /
SphereVisibleInCell against old-assembly cell planes), and gate 3
carries a known trapdoor: a zero-plane scissor-fallback slice is
PASS-ALL. This trace logs, per entity ON CHANGE: parent cell, look-in
exclusion hits, the viewcone verdict, and the cell''s lifted-plane
shape, so one 0104<->0101 crossing with the remote player in place
pins the admitting gate. Rain gate 75eab42f is owner-PASSED.

Hermetic 6,762/0.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

docs/launch-options.md

@@ -315,7 +315,7 @@ issue is closed, the strip was missed; delete both.
 | `ACDREAM_PROBE_CHILD_CELL` | c4 route 7 | `=1` | gates one `[child-cell]` line per Runtime committed-child canonical-cell write in `RuntimeLiveEntitySessionController`, `RuntimeEntityObjectLifetime`, `RuntimeEntityDirectory` (parent/child guid, old/new cell, cause tag) | print-only | `PhysicsDiagnostics.ProbeChildCellEnabled` |
 | `ACDREAM_PROBE_CLIPROUTE` | "throwaway apparatus — strip once §4 ships" | `=1` | print-on-change `[clip-route]` / `[clip-route-disp]` / `[clip-route-scis]` lines: outside-slice clip routing, region-SSBO bytes, terrain-UBO head, actual GL/RHI scissor state | print-only | `RenderingDiagnostics.ProbeClipRouteEnabled` |
 | `ACDREAM_PROBE_WALK_SHADOW` | Campaign FW3.2b-2 flip apparatus — dies with the flip commit | `=1` | runs the PRODUCTION retail frame walk per frame in SHADOW (no draws change) and prints one `[walk-shadow]` line per frame whose visited cell/building sets diverge from the old visibility path (the I5 dual-shadow pattern applied to the FW3 static cutover) | print-only; adds the per-frame CPU cost of the shadow walk while set | `RenderingDiagnostics.ProbeWalkShadowEnabled` |
-| `ACDREAM_PROBE_WALK_ROOT` | the cathedral Phase I instrumentation (synthesis doc `docs/research/2026-08-30-cathedral-synthesis.md`) — dies with that investigation | `=1` | prints `[walk-root]` rooting lines every ~30th frame AND for 8 frames after each interior/outdoor root flip (viewer/root cell, camera-cell resolution, slice count, the walk's OWN exit-view count, the TRUE root flood separated from the visited union, eye + forward); `[walk-cam]` replayable camera dumps (eye, viewport, full view-projection) every ~300 frames and at flips; `[falls]` lines on EVERY particle submission carrying a real falls owner (0xCF418000-13) with route + phase; `[falls-adm]` admission verdicts for F418 emitters (~every 120th ApplyRetailView); plus the earlier family — `[walk-part]` per-route submissions, `[walk-alpha]` drains, `[walk-dyn]` outside-stage verdicts (~120th product frame), `[walk-portal]` per-portal side/clip decisions (~90th frame) | print-only; chatty near particle-heavy scenes while set | `RenderingDiagnostics.ProbeWalkRootEnabled` |
+| `ACDREAM_PROBE_WALK_ROOT` | the cathedral Phase I instrumentation (synthesis doc `docs/research/2026-08-30-cathedral-synthesis.md`) — dies with that investigation | `=1` | prints `[walk-root]` rooting lines every ~30th frame AND for 8 frames after each interior/outdoor root flip (viewer/root cell, camera-cell resolution, slice count, the walk's OWN exit-view count, the TRUE root flood separated from the visited union, eye + forward); `[walk-cam]` replayable camera dumps (eye, viewport, full view-projection) every ~300 frames and at flips; `[falls]` lines on EVERY particle submission carrying a real falls owner (0xCF418000-13) with route + phase; `[falls-adm]` admission verdicts for F418 emitters (~every 120th ApplyRetailView); plus the earlier family — `[walk-part]` per-route submissions, `[walk-alpha]` drains, `[walk-dyn]` outside-stage verdicts (~120th product frame), `[walk-portal]` per-portal side/clip decisions (~90th frame), and `[dyn-route]` per-entity ON-CHANGE DynamicLast admission traces (parent cell, look-in exclusion, viewcone verdict, the cell's lifted-plane shape — "0" marks a pass-all zero-plane slice) | print-only; chatty near particle-heavy scenes while set | `RenderingDiagnostics.ProbeWalkRootEnabled` |
 | `ACDREAM_PROBE_CONTACT_PLANE` | spike-only, 2026-05-20 | `=1` | gates one `[cp-write]` line per write to `CollisionInfo.ContactPlane*`/`LastKnownContactPlane*` fields (field, old→new, caller method via stack walk, source line); only logs on actual value changes | print-only, but performs a stack walk to identify the caller method when firing — real CPU cost per write while on (not just a string format); suppresses no-op writes to bound volume | `PhysicsDiagnostics.ProbeContactPlaneEnabled` |
 | `ACDREAM_PROBE_ENT` | #138 | `="1"` | Traces the persistent player entity across teleport streaming churn: presence in the render draw-set flat view vs. survival of the dynamics cull, to distinguish "missing from draw set" vs "present but culled" | print-only, "Observation-only — emits no behavior change" (doc comment). `LogPlayerDynOnChange` dedupes by transition to avoid per-frame spam. Marked STRIP-once-root-caused (like the dense-town FPS apparatus). | `EntityVanishProbe.Enabled` (`EntityVanishProbe.cs:23-24`), issue #138-B |
 | `ACDREAM_PROBE_FLAP` | "throwaway apparatus — strip once the flap mechanism is confirmed" | `=1` | EVERY FRAME (unthrottled, not change-gated) while the camera root is indoor: `[flap]` from `PortalVisibilityBuilder.Build` (portal side-test/traverse/cull/projection) + paired `[flap-cam]` from `PhysicsCameraCollisionProbe`/`[flap-sweep]` (FindCameraCell resolution, eye positions) | print-only, but unthrottled per-frame `StringBuilder` allocation + `Console.WriteLine` on multiple call sites while indoor — heavy log volume/allocation under sustained indoor play; does not alter rendered output | `RenderingDiagnostics.ProbeFlapEnabled` |

src/AcDream.App/Rendering/Scene/RenderScenePViewFrameProduct.cs

@@ -1143,8 +1143,10 @@ internal sealed class RenderScenePViewFrameBuilder
     private int _dynamicCount;
 
     // ACDREAM_PROBE_WALK_ROOT companion (throwaway): rate limiter for the
-    // [walk-dyn] outside-stage classification dump.
+    // [walk-dyn] outside-stage classification dump, plus the [dyn-route]
+    // per-entity on-change admission cache.
     private uint _probeDynFrameCounter;
+    private readonly Dictionary<uint, string> _probeDynRouteStates = new();
     private int _dirtyCount;
     private RenderSceneGeneration _indexGeneration;
     private ulong _indexRevision;
@@ -1400,7 +1402,20 @@ internal sealed class RenderScenePViewFrameBuilder
             // would draw it after the boundary alpha drain and overpaint
             // nearer flames (the Holtburg candle-behind-door class).
             if (indoor && _lookInCellScratch.Contains(parentCellId!.Value))
+            {
+                if (AcDream.Core.Rendering.RenderingDiagnostics.ProbeWalkRootEnabled)
+                {
+                    string state = $"parent={parentCellId.Value:x8} lookin-excluded";
+                    if (!_probeDynRouteStates.TryGetValue(record.Source.LocalEntityId, out string? prev)
+                        || prev != state)
+                    {
+                        _probeDynRouteStates[record.Source.LocalEntityId] = state;
+                        Console.WriteLine(
+                            $"[dyn-route] id={record.Source.LocalEntityId:x} {state}");
+                    }
+                }
                 continue;
+            }
 
             Sphere(in record, out Vector3 center, out float radius);
             bool visible = indoor
@@ -1411,6 +1426,25 @@ internal sealed class RenderScenePViewFrameBuilder
                 : input.Viewcone.SphereVisibleOutside(
                     in center,
                     radius);
+            // ACDREAM_PROBE_WALK_ROOT companion (throwaway): the DynamicLast
+            // admission trace for the through-wall remote-player report —
+            // per entity, ON CHANGE: parent cell, look-in exclusion, the
+            // viewcone verdict, and the cell's lifted-plane shape ("0" = a
+            // pass-all zero-plane slice — the scissor-fallback trapdoor).
+            if (AcDream.Core.Rendering.RenderingDiagnostics.ProbeWalkRootEnabled
+                && indoor)
+            {
+                string state =
+                    $"parent={parentCellId!.Value:x8} vis={(visible ? 1 : 0)} "
+                    + $"cone={input.Viewcone.ProbeDescribeCell(parentCellId.Value)}";
+                if (!_probeDynRouteStates.TryGetValue(record.Source.LocalEntityId, out string? prev)
+                    || prev != state)
+                {
+                    _probeDynRouteStates[record.Source.LocalEntityId] = state;
+                    Console.WriteLine(
+                        $"[dyn-route] id={record.Source.LocalEntityId:x} {state} route=DynamicLast");
+                }
+            }
             if (!visible)
                 continue;
 

src/AcDream.App/Rendering/ViewconeCuller.cs

@@ -166,6 +166,23 @@ public sealed class ViewconeCuller
         return true;
     }
 
+    /// <summary>ACDREAM_PROBE_WALK_ROOT companion (throwaway): a cell's
+    /// lifted-plane shape for the [dyn-route] admission trace — "none"
+    /// (culls), or per-slice plane counts ("0" = a pass-all zero-plane
+    /// slice, the scissor-fallback trapdoor).</summary>
+    internal string ProbeDescribeCell(uint cellId)
+    {
+        if (!_cellPlanes.TryGetValue(cellId, out PlaneSet? set))
+            return "none";
+        var sb = new System.Text.StringBuilder();
+        for (int s = 0; s < set.Slices.Count; s++)
+        {
+            if (sb.Length > 0) sb.Append('+');
+            sb.Append(set.Slices[s].Count);
+        }
+        return sb.Length == 0 ? "empty" : sb.ToString();
+    }
+
     /// <summary>Sphere-vs-the-cell's-views: visible when any slice passes.
     /// A cell with no views culls (not in the draw list ⇒ never reached in
     /// retail). A zero-plane slice is pass-all.</summary>