Add hasKey() and getKey() helpers across keyed modules (tenth pass).

Domain-aware lookup aliases on modules that already expose listKeys/keyCount, including async indexes and probabilistic bloom sets.

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

state-crdts/hyper-p2p-crdt-version-vector/index.js

@@ -95,6 +95,14 @@ class HyperP2PCrdtVersionVector extends EventEmitter {
     return this.size()
   }
 
+  hasKey (key) {
+    return this._clock.has(String(key))
+  }
+
+  getKey (key) {
+    return this.get(key)
+  }
+
   get (peer) {
     return this._clock.get(assertPeer(peer)) || 0
   }