Prevent duplicate runtime settings activation

[KeyffMS]

Summary

• suppress the synchronous runtime settings observer only while RuntimeCoordinator publishes its own settings commit;
• apply exactly one explicit post-commit runtime reaction;
• preserve resume behavior from fault/emergency states and correct handling when profiles or automatic mode are disabled;
• add composed regression tests with SettingsCoordinator.Changed wired to HandleSettingsChanged;
• advance product metadata to 0.5.0.31.

Root cause

The synchronous Changed event could activate the overlay before the command returned, after which ResumeAutomaticOperation activated or retargeted the same overlay again.

Validation

Windows CI must pass the full build, test suite, and self-contained publish validation. The new tests assert one activation for both profile enabling and automatic-mode enabling.

Closes #34