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

ARCHITECTURE.md

@@ -2215,6 +2215,27 @@ per-sample dispatch path; this migration adds no manager lookup to it. The Unrea
 cannot be compiled in this Linux workspace, so their small source changes still need the Windows
 Unreal build before integration.
 
+### 8.52 Resolved boundary and landing capabilities — World Assembler M3 L42
+
+`ResolvedLayoutSnapshotV3::finalize` materializes runtime capability records from the immutable
+strate/interface fields before sampling begins. The upper interface records whether its Gradient FI
+bedrock air gap remains open and whether a SurfaceWorld-to-TunnelNetwork passage gets the special
+landing support profile. Per-strate passage records carry the existing SurfaceWorld landing profile,
+FloatingIslands route-support behavior, and passage-anchor column center policy. Shared boundary and
+passage composition reads these records; it no longer compares generator-kind strings.
+
+The records are deterministic derivatives of `generator_kind`, `transition_mode`, and the resolved
+adjacent strate, and are omitted from canonical JSON. Those source fields remain in the hashed layout,
+so owner layout IDs and density hashes retain their L41 identity. The upper strate still controls
+Hard/Gradient/Interleaved evaluation; each strate still composes ceiling, content, then breakable
+bedrock. L29 transition samples and the passage-mouth fade arithmetic are unchanged.
+
+`BindResolvedStratumFields` still tests the resolved generator kind once to bind the concrete
+SurfaceWorld, FloatingIslands, or legacy evaluator. Passage planning in `ResolvedLayoutInternal.h`
+also retains generator-specific anchor and default-mouth placement rules; those are outside the
+shared composition boundary policy. No Unreal source changed. See the L42 report for hashes, tier
+results and paired cost measurements.
+
 ## 9. Multiplayer model (listen-server first, dedicated-friendly)
 
 > **Status: transport is DESIGN ONLY — nothing is networked in-tree yet** (no `Replicated`/`HasAuthority`/RPCs; a