Add size() cardinality helper across modules (eighth pass).

Standardize a size() method after isEmpty() on every module with clearAll(), delegating to domain counts or snapshot fields so callers can query occupancy without parsing snapshots.

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

supercomputer/hyper-p2p-bandwidth-share/index.js

@@ -151,6 +151,10 @@ class HyperP2PBandwidthShare extends EventEmitter {
     return this.snapshot().offers === 0
   }
 
+  size () {
+    return this.snapshot().offers
+  }
+
   async ready () {
     if (this.swarm || !this.topic) return this
     await initModuleSwarm(this, {