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]>

trust-security/hyper-p2p-multisig-threshold/index.js

@@ -157,6 +157,10 @@ class HyperP2PMultisigThreshold extends EventEmitter {
     return this.snapshot().proposals === 0
   }
 
+  size () {
+    return this.snapshot().proposals
+  }
+
   createProposalBatch (entries) {
     if (!Array.isArray(entries)) throw new Error('entries array required')
     return entries.map((e) => this.createProposal(e.id, e.signers, e.threshold))