feat: add configurable PiecesOS auto-launch

[anthony-maio]

Summary

• add a persisted CLI setting for whether PiecesOS should auto-launch when a command needs it
• expose the setting through pieces config --auto-launch-pieces-os and --no-auto-launch-pieces-os
• respect the disabled setting in Settings.startup() and show a manual-start hint instead of trying to launch/install automatically
• add regression tests for both config persistence and startup behavior

Testing

• python -m pytest tests/config_command_test.py tests/auth_commands_test.py

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[Copilot]

Pull request overview

Adds a persisted CLI configuration flag controlling whether PiecesOS should be auto-launched when required, exposes it via pieces config, and updates startup behavior to respect the setting.

Changes:

• Add auto_launch_pieces_os to the CLI config schema/manager with a default of True.
• Extend pieces config to set and display the auto-launch setting.
• Update Settings.startup() to skip auto-launch when disabled and show a manual-start hint; add regression tests.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
tests/config_command_test.py	Adds tests for config command behavior and Settings.startup() behavior when auto-launch is disabled.
src/pieces/settings.py	Gates PiecesOS launch attempt on the persisted auto-launch flag; prints a manual-start hint when disabled.
src/pieces/config/schemas/cli.py	Adds auto_launch_pieces_os field to the persisted CLI config schema.
src/pieces/config/managers/cli.py	Adds getter/setter that persist auto_launch_pieces_os to disk.
src/pieces/command_interface/config_command.py	Adds CLI flag --[no-]auto-launch-pieces-os, examples, and display/output for the setting.

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