cli-e2e-testcase-writer

Write scenario-based end-to-end Go testcases for the compiled `lark-cli` binary under `tests/cli_e2e`. Use when adding or updating a CLI testcase that should autonomously explore help and schema output, build a self-contained lifecycle with `clie2e.RunCmd`, organize steps with `t.Run`, clean up with `t.Cleanup`, and assert JSON output with `testify/assert` and `gjson`.