Stop unmanaged renderer processes during upgrade

[VdustR]

TL;DR

Prevents duplicate Agent Touch Bar renderers when upgrading after the app was launched manually from Spotlight.

Follow-up for #51.

Cause

A manually launched renderer is not owned by the renderer LaunchAgent. Upgrade booted out the LaunchAgent but did not terminate that independent process before bootstrapping a new managed renderer.

Changes

• After unloading the renderer job, terminate remaining user-owned agent-touchbar-host processes.
• Wait up to five seconds for manual renderers to exit before bootstrap.
• Apply the same cleanup during uninstall.
• Cover cleanup ordering and uninstall behavior in script tests.

Verification

• Created the real duplicate state with one manual and one managed renderer.
• Re-ran ./scripts/install.sh; renderer process count changed from two to exactly one.
• agent-touchbar doctor --installation-only passes.
• PYTHONPATH=src python3 -m unittest tests.test_scripts
• bash -n scripts/install-renderer.sh scripts/uninstall.sh
• git diff --check

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Latest commit: 9e69093

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[chatgpt-codex-connector]

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