fix: closes #675

nexus/components/spatial-memory.js

@@ -694,15 +694,61 @@ const SpatialMemory = (() => {
     }
   }
 
+  // ─── CONTEXT COMPACTION (issue #675) ──────────────────
+  const COMPACT_CONTENT_MAXLEN = 80;   // max chars for low-strength memories
+  const COMPACT_STRENGTH_THRESHOLD = 0.5; // below this, content gets truncated
+  const COMPACT_MAX_CONNECTIONS = 5;    // cap connections per memory
+  const COMPACT_POSITION_DECIMALS = 1; // round positions to 1 decimal
+
+  function _compactPosition(pos) {
+    const factor = Math.pow(10, COMPACT_POSITION_DECIMALS);
+    return pos.map(v => Math.round(v * factor) / factor);
+  }
+
+  /**
+   * Deterministically compact a memory for storage.
+   * Same input always produces same output — no randomness.
+   * Strong memories keep full fidelity; weak memories get truncated.
+   */
+  function _compactMemory(o) {
+    const strength = o.mesh.userData.strength || 0.7;
+    const content = o.data.content || '';
+    const connections = o.data.connections || [];
+
+    // Deterministic content truncation for weak memories
+    let compactContent = content;
+    if (strength < COMPACT_STRENGTH_THRESHOLD && content.length > COMPACT_CONTENT_MAXLEN) {
+      compactContent = content.slice(0, COMPACT_CONTENT_MAXLEN) + '\u2026';
+    }
+
+    // Cap connections (keep first N, deterministic)
+    const compactConnections = connections.length > COMPACT_MAX_CONNECTIONS
+      ? connections.slice(0, COMPACT_MAX_CONNECTIONS)
+      : connections;
+
+    return {
+      id: o.data.id,
+      content: compactContent,
+      category: o.region,
+      position: _compactPosition([o.mesh.position.x, o.mesh.position.y - 1.5, o.mesh.position.z]),
+      source: o.data.source || 'unknown',
+      timestamp: o.data.timestamp || o.mesh.userData.createdAt,
+      strength: Math.round(strength * 100) / 100, // 2 decimal precision
+      connections: compactConnections
+    };
+  }
+
   // ─── PERSISTENCE ─────────────────────────────────────
-  function exportIndex() {
+  function exportIndex(options = {}) {
+    const compact = options.compact !== false; // compact by default
     return {
       version: 1,
       exportedAt: new Date().toISOString(),
+      compacted: compact,
       regions: Object.fromEntries(
         Object.entries(REGIONS).map(([k, v]) => [k, { label: v.label, center: v.center, radius: v.radius, color: v.color }])
       ),
-      memories: Object.values(_memoryObjects).map(o => ({
+      memories: Object.values(_memoryObjects).map(o => compact ? _compactMemory(o) : {
         id: o.data.id,
         content: o.data.content,
         category: o.region,
@@ -711,7 +757,7 @@ const SpatialMemory = (() => {
         timestamp: o.data.timestamp || o.mesh.userData.createdAt,
         strength: o.mesh.userData.strength || 0.7,
         connections: o.data.connections || []
-      }))
+      })
     };
   }