Justfile doesn't install everything necessary to run the test suite

[brettcannon]

test/harness isn't installed like it is in CI:

copilot-sdk/.github/workflows/python-sdk-tests.yml

Lines 77 to 79 in f9144f1

	- name: Install test harness dependencies
	working-directory: ./test/harness
	run: npm ci --ignore-scripts

[github-actions]

Thanks for reporting this, @brettcannon!

I've labeled this as a bug and testing issue. You're right that the justfile install recipe is missing the test harness dependency installation step that's present in the CI workflow. The justfile should include:

`@cd` test/harness && npm ci --ignore-scripts

This would ensure local development environments match CI behavior when running the test suite.

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