[scruplelesswizard]

Summary

• README: badges, a clearer introduction (works with any test runner, pinned and checksummed binary), a non-Ruby quick start, and a note on merging per-worker JUnit reports with junit-munger.
• example.yaml: replace deprecated ::set-output with $GITHUB_OUTPUT, fix the syncronize trigger typo (the PR trigger never fired on new commits), and use scruplelesswizard/split-tests@v1 instead of the old chaosaffe/...@v1-alpha.1.
• action.yml: update author to the current username.

No behavior change to the action itself.

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