Create add-global-flag-cli.md

.changes/add-global-flag-cli.md

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+---
+"cli": minor
+"cli-js": minor
+---
+
+Added a new `global` boolean flag to the `CliArg` struct to support global CLI arguments. This flag allows arguments like `--verbose` to be marked as global and automatically propagated to all subcommands, enabling consistent availability throughout the CLI.
+
+The new field is optional and defaults to false.