Add listKeys() and keyCount() helpers across modules (ninth pass).

Standardize key enumeration after size() on map- and registry-style modules, aliasing existing list* methods or primary store keys so callers can inspect occupancy without parsing snapshots.

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

oracles/hyper-p2p-decentralized-oracle/index.js

@@ -510,6 +510,14 @@ class HyperP2PDecentralizedOracle extends EventEmitter {
     return s.feeds.length + s.pendingReports
   }
 
+  listKeys () {
+    return this.listFeeds()
+  }
+
+  keyCount () {
+    return this.size()
+  }
+
   getStats () {
     return {
       ...this._stats,