feat(mnemosyne): add crystal mesh query + highlight/select API for click-to-inspect

nexus/components/spatial-memory.js

@@ -471,9 +471,50 @@ const SpatialMemory = (() => {
     return results.slice(0, maxResults);
   }
 
+
+  // ─── CRYSTAL MESH COLLECTION (for raycasting) ────────
+  function getCrystalMeshes() {
+    return Object.values(_memoryObjects).map(o => o.mesh);
+  }
+
+  // ─── MEMORY DATA FROM MESH ───────────────────────────
+  function getMemoryFromMesh(mesh) {
+    const entry = Object.values(_memoryObjects).find(o => o.mesh === mesh);
+    return entry ? { data: entry.data, region: entry.region } : null;
+  }
+
+  // ─── HIGHLIGHT / SELECT ──────────────────────────────
+  let _selectedId = null;
+  let _selectedOriginalEmissive = null;
+
+  function highlightMemory(memId) {
+    clearHighlight();
+    const obj = _memoryObjects[memId];
+    if (!obj) return;
+    _selectedId = memId;
+    _selectedOriginalEmissive = obj.mesh.material.emissiveIntensity;
+    obj.mesh.material.emissiveIntensity = 4.0;
+    obj.mesh.userData.selected = true;
+  }
+
+  function clearHighlight() {
+    if (_selectedId && _memoryObjects[_selectedId]) {
+      const obj = _memoryObjects[_selectedId];
+      obj.mesh.material.emissiveIntensity = _selectedOriginalEmissive || (obj.data.strength || 0.7) * 2.5;
+      obj.mesh.userData.selected = false;
+    }
+    _selectedId = null;
+    _selectedOriginalEmissive = null;
+  }
+
+  function getSelectedId() {
+    return _selectedId;
+  }
+
   return {
     init, placeMemory, removeMemory, update,
     getMemoryAtPosition, getRegionAtPosition, getMemoriesInRegion, getAllMemories,
+    getCrystalMeshes, getMemoryFromMesh, highlightMemory, clearHighlight, getSelectedId,
     exportIndex, importIndex, searchNearby, REGIONS,
     saveToStorage, loadFromStorage, clearStorage
   };