MAESTRO: Add OpenClaw plugin scaffold with configuration files

Create openclaw/ directory with plugin manifest (openclaw.plugin.json),
package.json, tsconfig.json, and .gitignore. Plugin manifest includes
full configSchema with observationFeed settings for live streaming
observations to messaging channels.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

openclaw/.gitignore

@@ -0,0 +1,2 @@
+node_modules/
+dist/