Run CLI tests against the checkout

[njzjz-bot]

Summary

• centralize the checkout CLI command as sys.executable -m dargs
• replace every PATH-dependent dargs subprocess invocation
• keep stdin and error-path coverage unchanged

Fixes #123.

Validation

• python -m unittest -v tests.test_cli with the generated version artifact available
• Ruff checks on changed files

AI attribution

Coding agent: Codex
Codex version: codex-cli 0.149.0
Model: gpt-5.6-sol
Reasoning effort: xhigh

[coderabbitai]

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Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 38a18ec2-0c27-4544-becb-38923a0dbf02

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[njzjz-bot]

Review result: one medium-severity issue found.

The replacement removes dependence on the dargs console script in PATH, but it still does not reliably pin child processes to the checkout. See the inline finding.

I reproduced seven CLI-test failures when unittest discovery was launched outside the repository: the parent imported the checkout, while child python -m dargs commands selected an older installed package. Root-directory CI remains green.

Coding agent: Codex
Codex version: codex-cli 0.149.0
Model: gpt-5.6-sol
Reasoning effort: xhigh

[njzjz-bot]

[P2] Pin subprocess module resolution to the checkout

python -m dargs resolves from the child process's working directory, not from the parent test runner's in-memory sys.path, so this constant does not reliably select the checkout. Running unittest discovery from /tmp imported these tests from the PR checkout in the parent, but the subprocesses selected an older installed dargs; I reproduced four errors and three failures with the old CLI that only exposed check. Please run the CLI subprocesses with cwd=this_directory.parent (preferably through a helper), or explicitly prepend the repository root to each child's PYTHONPATH.