feat: add --format selector with real Kubernetes ExecCredential output#39
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Replaces the boolean --all toggle with a --format selector (token|json|exec-credential). Adds a genuine Kubernetes ExecCredential envelope honoring --token-type and echoing KUBERNETES_EXEC_INFO apiVersion. Keeps --all as a deprecated alias for --format=json.
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Replaces the boolean `--all` toggle with a `--format` selector offering three output modes: `token` (default, bare token), `json` (the full JSON document, unchanged), and `exec-credential`. The new `exec-credential` mode emits a genuine Kubernetes `client.authentication.k8s.io` ExecCredential envelope (`apiVersion`/`kind`/`status.token`) that honors `--token-type` and echoes the apiVersion from `KUBERNETES_EXEC_INFO` (falling back to `v1`), so it works as a real kubectl exec-credential drop-in — the previous flat `--all` output would have been rejected by kubectl. `--all` is retained as a deprecated alias for `--format=json`, so existing 0.9.0 users are unaffected. Adds unit/config/cmd tests for the new writer, apiVersion resolution, format parsing, and the `--all` alias, and rewrites the kubectl section plus flags table in the README.