Make high-current PCB guidance available as an independent plugin

Add the released design and review workflow for BMS, power switches and distribution boards, including the reusable review template.

Constraint: Reuse the external-source adapter and latest-stable Gitea release flow; installation remains AVAILABLE.
Confidence: high
Scope-risk: narrow
Directive: Update the source repository and release version, then regenerate the plugin with the sync script.
Tested: Marketplace validator; plugin validator; exact generated skill/source equality; unchanged existing entries; source tag and release verification.
Not-tested: Codex install behavior; EDA execution; physical hardware performance.

.agents/plugins/marketplace.json

@@ -268,6 +268,18 @@
       },
       "category": "Developer Tools"
     },
+    {
+      "name": "high-current-pcb-design",
+      "source": {
+        "source": "local",
+        "path": "./plugins/codex/plugins/high-current-pcb-design"
+      },
+      "policy": {
+        "installation": "AVAILABLE",
+        "authentication": "ON_INSTALL"
+      },
+      "category": "Developer Tools"
+    },
     {
       "name": "karpathy-guidelines",
       "source": {