chore: import upstream snapshot with attribution

tests/cli_e2e/README.md

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+# CLI E2E Tests
+
+This directory contains end-to-end tests for `lark-cli`.
+
+The purpose of this module is to verify real CLI workflows from a user-facing perspective: run the compiled binary, execute commands end to end, and catch regressions that are not obvious from unit tests alone.
+
+## What Is Here
+
+- `core.go`, `core_test.go`: the shared E2E test harness and its own tests
+- `demo/`: reference testcase(s)
+- `cli-e2e-testcase-writer/`: the local skill for adding or updating testcase files in this module
+
+## For Contributors
+
+When writing or updating testcases under `tests/cli_e2e`, install and use this skill first:
+
+```bash
+npx skills add ./tests/cli_e2e/cli-e2e-testcase-writer
+```
+
+Then follow `tests/cli_e2e/cli-e2e-testcase-writer/SKILL.md`.
+
+Example prompt:
+
+```text
+Use $cli-e2e-testcase-writer to write lark-cli xxx domain related testcases.
+Put them under tests/cli_e2e/xxx.
+```
+
+## Run
+
+```bash
+make build
+go test ./tests/cli_e2e/... -count=1
+```