Change window title from "Questionnaire Multiagent" to "Fabric Questionnaire Agent"

[Copilot]

This PR updates the application window title to better reflect the current branding and functionality. The changes include:

Changes Made:

• Updated window title in question_answerer.py from "Questionnaire Multiagent" to "Fabric Questionnaire Agent"
• Updated module docstring to reflect the new application name
• Updated CLI help description to maintain consistency across all user-facing text
• Added comprehensive tests to verify the window title change works correctly

Testing:

• ✅ Source code verification confirms the title is properly set
• ✅ Runtime GUI test with virtual display validates the window title displays correctly
• ✅ CLI help shows the updated description
• ✅ Application functionality verified in mock mode to ensure no regressions
• ✅ Created demonstration showing the title change

The change is minimal and focused, affecting only the display strings without impacting any core functionality. All existing features continue to work as expected.

Before:

self.root.title("Questionnaire Multiagent")

After:

self.root.title("Fabric Questionnaire Agent")

Fixes #4.

Warning

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