refactor(core): boundary policy as resolved capabilities, not generator-name tests (L42, step 6); R9

ResolvedLayoutSnapshotV3::finalize maps each strate's generator and interface once into capability
records (FI gradient air-gap, surface/FI landing support, passage-anchor columns, SW-to-TN floor);
ApplyResolvedStrateBoundaryBand and passage composition read those instead of generator kinds. Derived
records stay out of canonical JSON, so layout identity is unchanged. Owner hashes identical to L41;
fast/medium/full PASS on clean Clang and GCC builds; cost within noise.
Research R9 (read-only): player-visible roadmap refresh.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016dhxM43dnWvUu2B5Ph1iG1

Standalone/Core/src/ResolvedLayoutInternal.h

@@ -409,6 +409,26 @@ bool ResolvedLayoutSnapshotV3::finalize(std::string& error)
         if(x.bedrock.kind.empty())x.bedrock.kind="bedrock";
         if(x.interiorTopMicrometres<=x.interiorBottomMicrometres||x.voxelSizeMicrometres==0)
         {error="resolved layout contains an invalid interior interval or voxel size";return false;}
+
+        // Materialize generator-specific composition policy at layout resolution. The
+        // sampling/composition path consumes these capabilities without examining names.
+        x.passageCapabilities={};
+        x.lowerInterfaceCapabilities={};
+        if(x.generatorKind=="SurfaceWorld")
+            x.passageCapabilities.hasSurfaceLanding=true;
+        else if(x.generatorKind=="FloatingIslands")
+        {
+            x.passageCapabilities.hasFloatingIslandLanding=true;
+            x.passageCapabilities.usePassageAnchorForColumns=true;
+        }
+        if(i+1<strates.size())
+        {
+            const auto& lower=strates[i+1];
+            x.lowerInterfaceCapabilities.preserveUpperBedrockAirGap=
+                x.generatorKind=="FloatingIslands"&&x.transitionMode=="Gradient";
+            x.lowerInterfaceCapabilities.surfaceToTunnelLandingSupport=
+                x.generatorKind=="SurfaceWorld"&&lower.generatorKind=="TunnelNetwork";
+        }
     }
     const std::int64_t playerCenterAboveFloorQ=static_cast<std::int64_t>(std::llround(
         1.13*WorldAssemblySubvoxelsPerVoxel*1000000.0/coreVoxelSizeMicrometres));