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]>

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

@@ -122,6 +122,10 @@ class HyperBareTargetMatrix extends EventEmitter {
     return this.snapshot().targets === 0
   }
 
+  size () {
+    return this.snapshot().targets
+  }
+
   addTargetBatch (entries) {
     if (!Array.isArray(entries)) throw new Error('entries array required')
     return entries.map((e) => this.addTarget(e.os, e.arch, e.extra || {}))