Add exportState and moduleSnapshot helpers across all module categories.

Fifth pass: complete measurement modules (sla-budget, histogram-gossip) with moduleSnapshot/toJSON; stats-exporter exportSnapshot; exportState() alias on modules with standard snapshot serialization.

Co-authored-by: Cursor <[email protected]>

agents-workflows/hyper-p2p-task-orchestrator/index.js

@@ -459,6 +459,10 @@ class HyperP2PTaskOrchestrator extends EventEmitter {
     return this.snapshot()
   }
 
+  exportState () {
+    return this.toJSON()
+  }
+
   getStats () {
     const counts = this.taskCounts()
     return {