[WIP] Address feedback on Worktree 2026-01-07 PR

[Copilot]

• Understand the current implementation of DiffEngine._nodes_similar()
• Understand how the test currently fails to test property modifications
• Fix the test to properly test property modification detection
• Verify that the fixed test correctly tests modification (not removal+addition)
• Run the test to ensure it passes
• Reply to the review comment

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