* ci: add auto label for "please sign the CLA"
As we're seeing some new contributors - a number of which are
Agent-driven - not sign the CLA, we can add an automagic label to hold
PRs for review until this is done.
* ci(auto-pr): remove review requests when CLA isn't signed
To protect reviewers' time.
Co-authored-by: Claude Sonnet 4.6 <jamie.tanna+claude-code@mend.io>
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Co-authored-by: Claude Sonnet 4.6 <jamie.tanna+claude-code@mend.io>