Add isEmpty() helpers across all modules with clearable state.

Seventh expansion pass: domain-specific isEmpty() after moduleSnapshot on every module that has clearAll(), using existing count/snapshot helpers (async variants for temporal, spatial, semantic-vector, and reactive-state indexes).

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

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

@@ -153,6 +153,10 @@ class HyperP2PMultisigThreshold extends EventEmitter {
     return this.snapshot()
   }
 
+  isEmpty () {
+    return this.snapshot().proposals === 0
+  }
+
   createProposalBatch (entries) {
     if (!Array.isArray(entries)) throw new Error('entries array required')
     return entries.map((e) => this.createProposal(e.id, e.signers, e.threshold))