refactor(framework): Move exit module to supercore

[panh99]

Summary

• move the internal exit package from flwr.common.exit to flwr.supercore.exit
• update all in-repo imports and moved tests to use the new module path

[Copilot]

Pull request overview

This PR relocates the internal exit helpers from flwr.common.exit to flwr.supercore.exit, aligning ownership with SuperCore runtime components and updating in-repo imports/tests accordingly.

Changes:

• Moved/introduced flwr.supercore.exit package (exit codes, exit function, exit handlers, signal handling) and corresponding tests.
• Updated internal imports across SuperLink/SuperNode/ServerApp/Simulation/CLI/compat code to import from flwr.supercore.exit.
• Adjusted a few tests/mocks/patch paths to the new module location.

Reviewed changes

Copilot reviewed 23 out of 29 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
framework/py/flwr/supernode/start_client_internal.py	Switch exit imports to flwr.supercore.exit.
framework/py/flwr/supernode/runtime/run_clientapp.py	Switch exit imports to flwr.supercore.exit.
framework/py/flwr/supernode/cli/flwr_clientapp.py	Switch exit imports to flwr.supercore.exit.
framework/py/flwr/supernode/cli/flower_supernode.py	Switch exit imports to flwr.supercore.exit.
framework/py/flwr/superlink/servicer/control/control_grpc.py	Switch exit imports to flwr.supercore.exit.
framework/py/flwr/supercore/superexec/run_superexec.py	Switch exit imports to flwr.supercore.exit.
framework/py/flwr/supercore/state/alembic/utils.py	Switch exit imports to flwr.supercore.exit.
framework/py/flwr/supercore/state/alembic/utils_test.py	Switch ExitCode import to flwr.supercore.exit.
framework/py/flwr/supercore/inflatable/inflatable_utils.py	Switch add_exit_handler import to flwr.supercore.exit.
framework/py/flwr/supercore/exit/init.py	New public surface for the relocated exit package.
framework/py/flwr/supercore/exit/exit.py	Adjust imports for new package location.
framework/py/flwr/supercore/exit/exit_code.py	New/relocated exit codes and help text.
framework/py/flwr/supercore/exit/exit_handler.py	New/relocated exit handler registration/execution.
framework/py/flwr/supercore/exit/signal_handler.py	New/relocated signal registration helper.
framework/py/flwr/supercore/exit/*_test.py	Tests updated/added for relocated exit functionality.
framework/py/flwr/supercore/cli/flower_superexec.py	Switch exit imports to flwr.supercore.exit.
framework/py/flwr/simulation/run_simulation.py	Switch exit imports to flwr.supercore.exit.
framework/py/flwr/simulation/app.py	Switch exit imports to flwr.supercore.exit.
framework/py/flwr/serverapp/exception.py	Switch ExitCode import to flwr.supercore.exit.
framework/py/flwr/server/superlink/fleet/rest_rere/rest_api.py	Switch exit imports to flwr.supercore.exit.
framework/py/flwr/server/serverapp/app.py	Switch exit imports to flwr.supercore.exit.
framework/py/flwr/server/app.py	Switch exit imports to flwr.supercore.exit.
framework/py/flwr/compat/server/app.py	Switch register_signal_handlers import to flwr.supercore.exit.
framework/py/flwr/compat/client/app.py	Switch exit imports to flwr.supercore.exit.
framework/py/flwr/client/rest_client/connection.py	Switch exit imports to flwr.supercore.exit.
framework/py/flwr/cli/supernode/register.py	Switch exit imports to flwr.supercore.exit.

Comments suppressed due to low confidence (1)

framework/py/flwr/supercore/exit/exit.py:35

• This relative import (from ...common.logger import log) is the only use of a triple-dot relative import to reach flwr.common in the repo; most modules use absolute imports like from flwr.common.logger import log. Consider switching to the absolute import for consistency/readability.

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