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]>

storage-hyperdrive/hyper-p2p-drive-mirror-sync/index.js

@@ -121,6 +121,11 @@ class HyperP2PDriveMirrorSync extends EventEmitter {
     return s.pending === 0 && s.tracked === 0
   }
 
+  size () {
+    const s = this.snapshot()
+    return s.pending + s.tracked
+  }
+
   getStats () {
     return driveStats(this._stats, PROTOCOL, {
       pending: this._queue.length,