refactor(render): S3 chunk 4 — delete the clip rules retail does not have and the cathedral discriminators

Campaign OVERHAUL S3 chunk 4 (docs/research/2026-09-01-overhaul/s3-walk-ownership-map.md §10). Retail
polygon-clips exactly three things on the CPU — portal polygons (PView::GetClip), punch fans
(DrawPortalPolyInternal against building_view), and exit seals (setup_view + polyClipFinish);
ordinary meshes, cell shells, terrain, particles and the weather are never view-clipped. Every
acdream-only clip rule beyond those three is deleted; the two that remain get a new CPU/GPU
equivalence pin.

DELETED (no retail counterpart):
- RetailPViewRenderer.DrawLandscapeDynamicsPhase's per-outside-view-slice weather loop
  (SetTerrainClip + ClearClipRouting + the old DrawLandscapeSliceLate leaf, one call per active
  landscape view) — retail's GameSky::Draw(sky,1) @0x00506ff0 runs ONCE, unclipped, after
  LScape::draw's whole block loop. RetailPViewPassExecutor.DrawWeatherOnce stays the one call site;
  it now also submits the rain particles (ParticleRenderPass.SkyPostScene) as ONE unclipped
  submission, folded in from the deleted loop's per-slice clipSlot draw.
- RetailPViewPassExecutor.DrawLandscapeSliceLate, RetailPViewLandscapeLateSliceContext,
  SetTerrainClip (the walk-level wrapper — its only caller was the deleted loop),
  ClearClipRouting (same), SetCellShellClipRouting (already had no caller), and
  UseIndoorMembershipOnlyRouting (4 call sites in RetailPViewRenderer.cs) — all "first view clips
  the shell" residue: SetCellShellClipRouting was the ONLY place EnvCellRenderer.SetClipRouting
  ever received a non-null value anywhere in the app, so once it's gone,
  UseIndoorMembershipOnlyRouting's own clear calls are provably permanent no-ops. AbortFrame's
  matching TryAbort(SetClipRouting(null))/TryAbort(ClearClipRouting) lines are dropped for the
  same reason. KEPT: BeginDoorwayScissor, _surface.BindTerrainClip(), EnableClipDistances/
  DisableClipDistances, and IWorldPassSurface.SetTerrainClip/ClipFrame.SetTerrainClip/
  PrepareClipFrame's terrain-clip publish — all still have real consumers (DrawWalkSky's per-slice
  outdoor sky mesh draw; the always-bound TerrainClip UBO section) or are shared classic (non-walk)
  infrastructure out of this chunk's ownership (WorldScenePassExecutor, PortalTunnelPresentation).
- WbDrawDispatcher.WalkClassify.ResolvePartClipSlots (renamed ResolvePartVisible, returns bool) and
  RetailWholeMeshSlot: the per-view clip-slot LIST always collapsed to either nothing or one
  element (RenderDeviceD3D::DrawMesh @0x005A0860 submits the whole mesh once any view admits it) —
  never anything but a Boolean wearing a list-shaped costume. IWalkLookInViewSource.
  VisibleClipSlotsInLookInTurn is deleted outright (no consumer besides that collapse);
  SphereVisibleInLookInTurn gained VisibleClipSlotsInLookInTurn's own testSphere parameter so the
  no-authored-sphere case ("any admitted view, geometry ignored") still has a home.
  EmitClassifiedBatches now emits exactly one batch per surviving TryClassifyBatch using the
  entity's own classic slot (always 0 while _clipRoutingActive is never armed by the walk path).
- The six ProbeCathedralSkip*/ProbeCathedralShellOrderEnabled discriminators (RenderingDiagnostics,
  their six docs/launch-options.md rows, every read site in WalkFrameDriver/
  RetailPViewPassExecutor.WalkLeaf/RetailPViewRenderer, and the WalkFrameDriver.
  TraceCathedralShellOrder method + RetailPViewRenderer._probeCathedralShellOrderFrame it served) —
  the investigation is closed: the cathedral leak is retail behavior, not an acdream defect to
  discriminate.

O1-O4 (the ledger's carried chunk-1 items, closed here because this chunk owns the weather path):
IWalkEventSink gains OnWeatherTurn(viewerCellId), fired by RetailFrameWalk.DrawLandscape
UNCONDITIONALLY at retail's own call-site shape (GameSky::Draw(sky,1) is itself unconditional from
LScape::draw; the is_player_outside gate lives inside it) but gated by the walk context's own new
WeatherGateOpen/ViewerCellId members (default false/0, so every other IRetailFrameWalkContext
implementer — test fixtures, the FW1 conformance replay context — is unaffected).
WalkProductionFrameContext wires RetailPViewFrameInput.ViewerCellId and
RetailPViewPassExecutor.ShouldDrawWeatherOnce(RenderSky, RenderWeather, PlayerCellId) into those two
members. WalkFrameDriver.OnWeatherTurn prints the "OC" transcript line at COLLECT time; the print is
removed from DrawWeatherOnce (the DRAW stays there, at Replay). Because DrawLandscape's new call sits
at the very end of the method, an outdoor root's transcript naturally ends with the line and an
interior root's lands strictly between "LS" and the flood's first "EC" — exactly retail's position —
with no extra plumbing.

Kept items each get a synthetic-view CPU/GPU equivalence pin (ClipFrameLayoutTests): exit seals via
the real ClipFrame.AppendSlot/GetSlotPlanes round trip, punch fans via the direct
ClipViewSlice.Planes = cps.PlaneArray assignment ClipFrameAssembler.Assemble uses — both assert every
polygon edge midpoint has ~0 signed distance under the GPU-read-back planes and non-negative distance
under every plane.

Every new pin's mutation was hand-verified this session (temporarily reintroduced, confirmed the
exact failing assertion, then reverted): a duplicated OnWeatherTurn call fails Assert.Single with
"2 matching items" on both the outdoor and interior position tests; suppressing the Collect-time
call fails the same assertions with "did not contain any matching items"; perturbing one GPU plane's
offset by 0.05 fails the exit-seal equivalence pin with "the closest plane was only 0.050000012
away". WalkProductionFrameContextTests pins that the ViewerCellId/WeatherGateOpen storage seam
itself never drops or swaps its own two constructor/Reset arguments.

No register row added or removed — every change here deletes an acdream-only rule; none introduces
a new deviation. Full solution build: 0 warnings/0 errors. App hermetic 6,829/6,829 (was 6,828 base
+ 1 new pin). InstalledDat 244 pass/1 skip/4 known (2x #383, TowerAscent, and the pre-existing #458
WalkLandscape.CheckBlocks block-visibility divergence — unrelated to this chunk, untouched by it).
Core.Tests Rendering 216/216.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

docs/launch-options.md

@@ -331,12 +331,6 @@ issue is closed, the strip was missed; delete both.
 | `ACDREAM_PROBE_PVINPUT` | "throwaway apparatus — strip once the jitter source is pinned" | `=1` | one `[pv-input]` line/frame with 6-dp-precision `PortalVisibilityBuilder.Build` inputs (camera eye, player position, VP elements) + resulting flood-cell count; deliberately runs WITHOUT the heavier `[flap]` probe so the log stays diffable | print-only | `RenderingDiagnostics.ProbePvInputEnabled` |
 | `ACDREAM_PROBE_REMOTE_SLIDE` | bug b, temporary — strip once two-client roof capture lands | `=1` OR `=<comma-separated hex GUID list>` | gates `[remote-slide-up]`/`[remote-slide-vec]`/`[remote-slide-snap]`/`[remote-slide-enq]` lines across `LiveEntityNetworkUpdateController`, `InterpolationManager`, `RuntimeRemotePhysicsUpdater`, `RuntimeRemoteSteadyStatePosition` tracing two candidate remote-slide "blip" producers | print-only; `BeginRemoteSlideAttribution`/GUID-stamping calls are UNCONDITIONAL at several call sites (self-guard is internal), so a `[ThreadStatic]` field write happens on every remote tick regardless of the flag (cheap, non-allocating); a GUID allow-list narrows output to specific entities for a readable two-client capture | `PhysicsDiagnostics.ProbeRemoteSlideEnabled` + `ProbeRemoteSlideGuids` (raw string parsed via `ParseHexIdList` unless it's the literal `"1"`) |
 | `ACDREAM_PROBE_REMOTE_TELEPORT` | c4 route 4b-3, temporary | `=1` | gates one `[remote-teleport]` line per routed remote teleport arm in `LiveEntityNetworkUpdateController.ApplyRemoteContactRouting` | print-only; a 2026-08-04 fix moved the enabled-check to the CALL SITE because the probe's internal self-guard did not prevent `teleportStatus.ToString()` from being evaluated/allocated on every teleport regardless of flag state — now properly guarded | `PhysicsDiagnostics.ProbeRemoteTeleportEnabled` |
-| `ACDREAM_PROBE_CATHEDRAL_SKIP_PUNCH` | Campaign FW floating-stair discriminator (committed by the `b3b7d922` investigation checkpoint) | `=1` | suppresses only the far-Z portal punch of the authored building whose look-in owns cell `0xF4180112`, the moving transparent seam at the `0xF4180107/0112` floating stairs | **Behavior-changing diagnostic**; never use as a production fix; scheduled for deletion in Campaign OVERHAUL S5 | `RenderingDiagnostics.ProbeCathedralSkipStairBuildingPunch` |
-| `ACDREAM_PROBE_CATHEDRAL_SKIP_CELL_SHELLS` | Campaign FW floating-stair carrier discriminator | `=1` | suppresses only the visible EnvCell shells of cells `0xF4180107` and `0xF4180112`; missing walls are intentional so the moving wall-textured triangles can be attributed or exonerated | **Behavior-changing diagnostic**; never use as a production fix | `RenderingDiagnostics.ProbeCathedralSkipFloatingStairCellShells` |
-| `ACDREAM_PROBE_CATHEDRAL_SKIP_SOUTH_LOOKIN_SHELLS` | Campaign FW south-building carrier discriminator | `=1` | suppresses the visible EnvCell shells of `0xF4180112/0113/0114` only during the south building's pre-clear look-in; the ordinary interior-root repaint is unchanged | **Behavior-changing diagnostic**; never use as a production fix | `RenderingDiagnostics.ProbeCathedralSkipSouthLookInCellShells` |
-| `ACDREAM_PROBE_CATHEDRAL_SKIP_LOOKIN_SHELL` | Campaign FW exact look-in shell discriminator | full hexadecimal cell id, e.g. `F4180112` | suppresses one exact EnvCell shell only when reached through a building look-in; its ordinary interior-root repaint is unchanged | **Behavior-changing diagnostic**; never use as a production fix | `RenderingDiagnostics.ProbeCathedralSkipLookInShellCellId` |
-| `ACDREAM_PROBE_CATHEDRAL_SKIP_SOUTH_BUILDING_SHELL` | Campaign FW south-building carrier discriminator | `=1` | suppresses only the own exterior shell of the cathedral building anchored at `0xF4180112`; its portal walk, look-in cells, and particles remain live | **Behavior-changing diagnostic**; never use as a production fix | `RenderingDiagnostics.ProbeCathedralSkipSouthBuildingShell` |
-| `ACDREAM_PROBE_CATHEDRAL_SHELL_ORDER` | Campaign FW floating-stair shell-order trace | `=1` | samples the ONE walk's actual replay event order every fifth cathedral frame (`CLEAR`, `SEALS`, punches, marks, and EnvCell shells) and reports render-stamp-deduplicated whole-shell turns for cells `0xF4180104/0106/0107/0112/0113/0114` | print-only; never changes admission, depth state, or draw order | `RenderingDiagnostics.ProbeCathedralShellOrderEnabled` |
 | `ACDREAM_PROBE_FACILITY_STAIRS` | #177 Facility Hub stair probe (committed by the `b3b7d922` investigation checkpoint) | `=1` | traces the classifier admission, ordered-stream append, ring upload, and final indirect draw of the authored stair GfxObj `0x010000DE` and the local-player setup parts in cells `0x8A02015E/015F/01C1`, plus the walk root signature for those cells; Campaign OVERHAUL S2 chunk 5 added a `[walk-membership]` line, printed once at the start of a frame only when `WalkProductionWorldData.UnregisteredRenderMembershipCount` was nonzero the PRIOR frame (an entity the registry flooded into a cell but the presentation scene could not resolve yet that frame) | print-only; never influences admission, order, or depth state; scheduled for deletion in Campaign OVERHAUL S5 | `RenderingDiagnostics.ProbeFacilityStairsEnabled` (read sites in `RetailPViewRenderer`, `WalkPView`, `WalkProductionWorldData`, `WalkStaticStreamPopulator`, `WbDrawDispatcher.*`) |
 | `ACDREAM_PROBE_SEAMDRAW` | #176, "throwaway apparatus" | `"1"`/`"true"`/blank → default #176 Facility Hub cell set (7 fixed hex ids); otherwise comma-separated hex cell-id list | change-deduped + 2 s-heartbeat `[seam-cell]`/`[seam-snap]`/`[seam-ent]`/`[seam-mask]` lines from `EnvCellRenderer.Render` and `WbDrawDispatcher` describing per-instance transforms and resolved light-set identities at target cells | print-only | `RenderingDiagnostics.ProbeSeamDrawEnabled` / `SeamDrawTargetCells` |
 | `ACDREAM_PROBE_STEP_WALK` | a6.p3 issue #98 | `=1` | gates `[step-walk]` lines at select points in the transition sub-step loop and step-down probe (requested vs adjusted offset, sphere positions, contact planes, walkable flags) | print-only; no DebugPanel mirror | `PhysicsDiagnostics.ProbeStepWalkEnabled` |