fix(teleport D): cell-march preserves seed landblock id when no resident LB (no more lbX=0 outbound)

BuildCellSetAndPickContaining discarded the bool from TryGetTerrainOrigin — when
the current landblock's terrain hadn't been applied yet (priority-apply in flight
after a teleport or dungeon exit), blockOrigin was silently set to (0,0,0). The
AdjustToOutside/GetOutsideLcoord math treated world-frame sphere coordinates as
block-local and marched the cell one landblock per tick in the direction of movement
until lbX or lbY underflowed to 0x00. ACE rejected every subsequent move as a
failed transition.

Fix: honor the bool return. When terrain is unregistered for an OUTDOOR seed
(low < 0x0100), return currentCellId verbatim — "no block-local frame →
preserve". This mirrors the NO-LANDBLOCK verbatim contract in PhysicsEngine.Resolve
and is correct: the cell stays last-known-correct until terrain registers.
Indoor seeds are explicitly excluded (blockOrigin is never consumed by the indoor
pick path; outdoorPickAllowed=false for indoor seeds).

Reproduce + verify via CellMarchLandblockPreservationTests (two new FAILING-before
tests: WestEdge and SouthEdge with empty cache, no anchor → lbX/lbY preserved).
TeleportFarTownRunawayTests updated: no-anchor path now also preserves (pre-fix it
marched south to 0x59; post-fix returns currentCell unchanged).
CellTransitFindCellSetTests, Issue112MembershipTests, PhysicsEngineTests: added
RegisterTerrain for the streaming-center block (in production it is always resident
before outdoor resolves run; tests that used blockOrigin=(0,0,0) as an implicit
fallback now register the block explicitly). All 1567 tests pass.

Divergence AD-30 added to retail-divergence-register.md.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/AcDream.Core.Tests/Conformance/Issue112MembershipTests.cs

@@ -34,6 +34,12 @@ public sealed class Issue112MembershipTests
             try { ConformanceDats.LoadEnvCell(dats, cache, lbPrefix | low); }
             catch { }
         }
+        // #145 D: register terrain for the block so TryGetTerrainOrigin succeeds for
+        // outdoor seeds (in production the streaming-center landblock is always resident
+        // before outdoor physics resolves run). Tests use block-local coordinates, so
+        // origin is (0,0,0). Without this, Component D's early-return for unregistered
+        // terrain would prevent the building-portal walk that promotes outdoor→indoor.
+        cache.CellGraph.RegisterTerrain(lbPrefix, new TerrainSurface(new byte[81], new float[256]), Vector3.Zero);
         return cache;
     }