Remove the earlier pytest commands block and update the tox 'commands' to run pytest with the marker excluding both 'hardware' and 'dlclive_compat'. Adjust coverage invocation to use the installed package path (--cov={envsitepackagesdir}/dlclivegui) and emit per-env XML coverage files (.coverage.{envname}.xml). This aligns tox behavior with the GitHub Actions job and removes the prior posargs-based command duplication.

Update the GitHub Actions testing matrix to run on Python 3.12 instead of 3.11. This moves CI to test against the newer Python runtime while keeping existing matrix include entries unchanged.

Add a PoseBackends Enum and switch PoseSource.backend from a string to that enum for stronger typing and clarity. Update default PosePacket/PoseSource instances and the validate_pose_array signature to use PoseBackends.DLC_LIVE. Import Enum/auto and remove an unused sentinel variable. These are small refactors to improve type-safety and consistency around backend identification.

Add tests/compat/conftest.py to inject a stub torch module into sys.modules when torch is not installed. This prevents ImportError during DLCLive compatibility tests so the API can be validated without requiring torch to be installed. This is a pragmatic workaround and includes a note to remove or replace it once imports are properly guarded in the package.

Replace QTimer.singleShot with a cancellable QTimer instance (self._camera_validation_timer) that is single-shot, connected to _validate_configured_cameras, and started with a 100ms delay. The closeEvent now stops the timer if it's still active to prevent validation from firing while the window is closing, avoiding modal QMessageBox races/crashes during tests/CI teardown.

dlc_processor: broaden validate_pose_array signature to accept source_backend as PoseBackends|str and add a check_finite option (default True) that raises on non-finite values to catch invalid pose outputs early.

tests: make torch stubbing more robust by using importlib.util.find_spec in tests/compat/conftest.py; update tests/compat/test_dlclive_package_compat.py to refine _get_signature_params typing, import Parameter, and handle constructors that accept **kwargs more gracefully (provide clearer diagnostic when expected GUI kwargs may be passed through).

tox.ini: add a [testenv:dlclive] passenv block for DLCLIVE test env vars and propagate that passenv to dlclive-pypi and dlclive-github envs so DLCLive compatibility tests pick up required environment variables.

Add helper functions to inspect method signatures (_signature_accepts_positional_after_self and _signature_accepts_keyword) and replace previous name-based parameter checks for DLCLive.init_inference and DLCLive.get_pose. Tests now verify that these methods accept a frame-like positional argument after self and that get_pose accepts frame_time as a keyword (or **kwargs). Also update an example in the docstring to match the new signature helper usage and improve assertion messages.