trigger CLI docs update workflow on CLI repo tags

[dangrondahl]

The `update-cli-docs.yml` workflow in this repo should fire automatically
when a new tag is pushed to `kosli-dev/cli`, rather than requiring manual
workflow dispatch.

Tasks

• Add a workflow in `kosli-dev/cli` that emits a `repository_dispatch` event
  with type `cli-release` and payload `{ "tag": "" }` on new tags
• Verify the dispatch triggers `update-cli-docs.yml` end-to-end

Note

This work lives in the `kosli-dev/cli` repository.

References

• `.github/workflows/update-cli-docs.yml`