fix: stop discovered sandbox containers

[Ker102]

Summary

• make sandbox down localstack-aws discover and stop timestamped LocalStack containers created by fallback startup
• allow explicit LocalStack container shutdown such as nullstate sandbox down localstack-20260510103849
• keep backend shutdown scoped by expected LocalStack image and name prefix

Verification

• python -m unittest tests.test_sandbox.SandboxTests.test_localstack_down_plan_accepts_discovered_container_names tests.test_sandbox.SandboxTests.test_sandbox_down_discovers_backend_containers tests.test_sandbox.SandboxTests.test_sandbox_down_accepts_explicit_localstack_container_name -v
• python -m nullstate sandbox down localstack-aws --dry-run
• python -m nullstate sandbox down localstack-20260510103849 --dry-run
• python -m unittest tests.test_sandbox -v
• python -m ruff check src\nullstate\cli.py src\nullstate\sandbox.py tests\test_sandbox.py
• python -m mypy src

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 478eb86d-d7b9-4777-ab4d-0b6bc2eb2044

📥 Commits

Reviewing files that changed from the base of the PR and between 6df8b00 and c037486.

📒 Files selected for processing (3)

• src/nullstate/cli.py
• src/nullstate/sandbox.py
• tests/test_sandbox.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/sandbox-down-targets

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