dev-qemu: Add integration test to CI

[kurtjd]

Adds basic integration testing against dev-qemu in CI.

• Add a script that starts the dev-qemu instance and makes each service request against it from the ec-test-cli app. Right now, we only check that the request completed successfully which is still useful to ensure things aren't completely broken/deadlocked, but don't have good plumbing in place to check the returned results against a range of expected results (that's next on the todo list).
• Add a run-headless alias to dev-qemu which runs the platform without defmt logging. Mainly useful so we don't need to install defmt-print during the CI job (since we don't really need the logs).
• Add a integration-test which kicks off the script on PR.

The idea is this will mainly catch any significant breakage in the integration of the services as we update embedded-services here.

Note: odp-platform-common is still private so the job will likely fail at the moment until it's made public (since the job needs to install ec-test-cli from it)

Assisted-by: GitHub Copilot:claude-opus-4.6

[Copilot]

Pull request overview

Adds a basic CI integration-test job that boots the dev-qemu platform in QEMU and exercises ec-test-cli commands against it, providing an early deadlock/regression signal for the service plumbing.

Changes:

• Add scripts/integration-test.sh to start dev-qemu, discover its PTY serial device, and run a suite of ec-test-cli requests.
• Add a run-headless Cargo alias for dev-qemu to run without defmt output and with a CI-friendly runner.
• Add an integration-test job to .github/workflows/check.yml that installs QEMU + ec-test-cli and runs the script.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 6 comments.

File	Description
scripts/integration-test.sh	New integration test driver script that launches QEMU and runs ec-test-cli commands.
platform/dev-qemu/.cargo/config.toml	Adds run-headless Cargo alias to run dev-qemu without defmt logging and with an explicit QEMU runner.
.github/workflows/check.yml	Adds a new GitHub Actions job to install dependencies and execute the integration test script.