feat: runner accepts git/npx sources, broker delegates extraction

Runner /load now accepts gitUrl, npxPackage, or sourcePath. It handles
git clone and npm install internally. Broker no longer needs shared
volume for source extraction — just tells the runner what to fetch.

CLI mesh_mcp_deploy now supports npx_package as a third source type.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/cli/package.json

@@ -1,6 +1,6 @@
 {
   "name": "claudemesh-cli",
-  "version": "0.8.5",
+  "version": "0.8.6",
   "description": "Claude Code MCP client for claudemesh — peer mesh messaging between Claude sessions.",
   "keywords": [
     "claude-code",