[flowerthrower]

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Description

Add mqt-core-qdmi-check --device ID --timeout SECONDS on Linux and macOS. It selects a device through the same client opening API as the Slurm adapter, accepts IDLE/BUSY, and shares its availability check without submitting a job. A supervised worker bounds initialization, status queries, and process-exit cleanup; provider output is suppressed. Native installations and Python wheels expose the same command.

The checker uses Core's runtime-copy helper and installs directly in bin. Builds retain CMake's dependency paths; installation applies the existing relocatable RPATH.

Fixes #2311. Stacked on #2599. The MIT checker has no Slurm or GPL dependency. Success is a readiness snapshot, not a reservation or submission guarantee.

The native checker needs its own catalogue configuration; it does not inherit Python entry-point discovery or in-process manifest registration.

Validation

• Full Nox lint and changed-file C++ lint pass on Linux with Clang 23.
• Both native shared-build checker CTests pass with an inherited invalid MQT_CORE_QDMI_DRIVER. The installed-catalogue regression also reproduces the failure before test isolation and passes afterward.
• All 20 focused Slurm adapter and installed CLI tests pass against the final wheel, including checker argument forwarding.
• The complete Slurm 25.11.2 Docker suite passes against the stacked wheel.
• macOS and Windows were not rerun locally. Hosted checks are still running; the failed aggregate belongs to cancelled duplicate run 37966953454.

Codex assisted implementation, validation, and this description. Human review and acceptance are pending.

Checklist

• The pull request only contains commits that are focused and relevant to this change.
• I have added appropriate tests that cover the new/changed functionality.
• I have updated the documentation to reflect these changes.
• The changes follow the project's style guidelines and introduce no new warnings.
• The changes are fully tested and pass the CI checks.
• I have reviewed my own code changes.

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[codecov]

Codecov Report

❌ Patch coverage is 93.22034% with 8 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/qdmi/Check.cpp	90.4%	8 Missing ⚠️

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[burgholzer]

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The availability command is incorporated into #2599 (b965ed922), rebased on main and using #2715's common launcher and runtime installation helpers. The separate availability header and Python launcher are removed. Focused native tests cover IDLE/BUSY, unavailable devices, initialization timeout, and exit-handler timeout; the fresh-wheel Slurm test covers explicit job gating. Closing this separate layer in favor of the consolidated PR.