Add notification hook and run summary

internal/cli/run.go

@@ -45,7 +45,7 @@ Options:
   --config <path>  Path to config file
   --dry-run        Load and validate config without publishing
 
-Execution behavior is not implemented yet. Dry-run currently prints a resolved
-configuration summary only.
+Run discovers local source bundles, plans each configured destination, publishes
+selected outputs unless --dry-run is set, and prints a final status summary.
 `)
 }