refactor: consolidate Claude/Codex MCP runtime (#15)

* refactor: consolidate Claude/Codex MCP runtime in common module

* chore: normalize common MCP file permissions

* docs: drop shared runtime section from README

Author: benvinegar

claude/common/mcp/glance-mcp.js

@@ -24,6 +24,7 @@
   "files": [
     ".claude-plugin",
     ".mcp.json",
+    "common/mcp/glance-mcp.js",
     "servers/glance-mcp.js",
     "README.md"
   ],