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]>

pear-platform/hyper-bare-target-matrix/index.js

@@ -118,6 +118,10 @@ class HyperBareTargetMatrix extends EventEmitter {
     return this.snapshot()
   }
 
+  isEmpty () {
+    return this.snapshot().targets === 0
+  }
+
   addTargetBatch (entries) {
     if (!Array.isArray(entries)) throw new Error('entries array required')
     return entries.map((e) => this.addTarget(e.os, e.arch, e.extra || {}))