docs(standards): add MCP setup page covering all clients and servers

New wiki page documents the ten per-repo MCP servers (standards + libraries, ports 8001-8010) and per-client config for Claude Code, Codex, Antigravity, OpenCode, and PyCharm, each with linked localhost / mcp.aetoskia.com tabs.

standards/mcp/index.json

@@ -1,6 +1,6 @@
 {
   "project": "standards",
   "type": "standards",
-  "modules_count": 22,
+  "modules_count": 23,
   "source": "hand-authored"
 }

standards/mcp/nav.json

@@ -104,6 +104,11 @@
     "resource": "docs://modules/wiki_development_releasing",
     "title": "Releasing & Versioning"
   },
+  {
+    "module": "wiki_mcp_setup",
+    "resource": "docs://modules/wiki_mcp_setup",
+    "title": "🔌 MCP Setup"
+  },
   {
     "module": "wiki_index",
     "resource": "docs://modules/wiki_index",