Adding support for working-dir to dev tool commands

[barney-s]

Built on top of #93

review only second commit

[k8s-ci-robot]

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[netlify]

✅ Deploy Preview for agent-sandbox canceled.

Name	Link
🔨 Latest commit	d5be465
🔍 Latest deploy log	https://app.netlify.com/projects/agent-sandbox/deploys/68f139bca92765000816f5c4

[justinsb]

Code looks fine, but not sure I understand the use-case. What is the use-case where I want to use working-dir?

[k8s-ci-robot]

PR needs rebase.

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[k8s-ci-robot]

@barney-s: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
presubmit-agent-sandbox-unit-test	d5be465	link	true	/test presubmit-agent-sandbox-unit-test
presubmit-test-autogen-up-to-date	d5be465	link	true	/test presubmit-test-autogen-up-to-date
presubmit-agent-sandbox-e2e-test	d5be465	link	true	/test presubmit-agent-sandbox-e2e-test

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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