feat: index loaded resource discovery

docs/BUILD_IN_PUBLIC_PLAN.md

@@ -770,17 +770,21 @@ Completed:
     cascading homes, bridge, waterfall, terrain-following river, conifer/tree
     clusters, and ambient butterflies. Roughly 10,400 camera-local grass
     particles remain short and patchy and bend from real actor transforms.
+35. Loaded-resource spatial discovery: `ActiveWorldAdapter` now indexes loaded
+    stable-ID resource anchors in a resource-specific horizontal grid. Exact
+    expanding queries preserve current scoring and selected targets while the
+    reviewed 1,800-source case inspects about 4.4 candidates instead of 1,800.
 
 Next:
 
-1. Measure and implement a loaded-resource spatial query through
-   `ActiveWorldAdapter` for far-apart Terrain3D-authored finite sources. Keep
-   simulation-owned resource records, stable IDs, current score/reachability,
-   reservations, player parity, and unload/rebind behavior unchanged.
-2. Sculpt a real Terrain3D river channel and waterfall shelf before adding a
+1. Sculpt a real Terrain3D river channel and waterfall shelf before adding a
    broad foliage asset pass. Use Terrain3D particles for nearby grass and
-   intentional instancing for tree/fern/rock masses; add livestock only with a
-   real identity and interaction contract.
+   intentional instancing for tree/fern/rock masses, then rebake and validate
+   the required village/resource routes.
+2. During that first larger foliage pass, prove a bounded authoring workflow
+   that places intentional stable-ID `ResourceNode` anchors beside decorative
+   Terrain3D instances. Add livestock only with a real identity and interaction
+   contract.
 
 Do not start with GIS data, a full city, a large asset pack, or more NPC
 mechanics. The next proof is a beautiful stage for the systems that already