refactor diffusion to r-sem edges with time window and add rVector I/O

modules/story-summary/vector/storage/state-store.js

@@ -205,6 +205,8 @@ export async function saveStateVectors(chatId, items, fingerprint) {
         floor: item.floor,
         vector: float32ToBuffer(new Float32Array(item.vector)),
         dims: item.vector.length,
+        rVector: item.rVector?.length ? float32ToBuffer(new Float32Array(item.rVector)) : null,
+        rDims: item.rVector?.length ? item.rVector.length : 0,
         fingerprint,
     }));
 
@@ -222,6 +224,7 @@ export async function getAllStateVectors(chatId) {
     return records.map(r => ({
         ...r,
         vector: bufferToFloat32(r.vector),
+        rVector: r.rVector ? bufferToFloat32(r.rVector) : null,
     }));
 }