[Test] Add direct outputs array verification

[coderabbitai]

Context

From PR #34 review discussion: #34

The integration test currently only checks execution_count but never directly verifies the outputs array content or structure.

Problem

The test doesn't verify:

• Whether outputs were actually cleared for resolved conflicts
• Whether outputs were preserved for identical cells
• The content/structure of the outputs array
• Difference between empty outputs: [] vs missing outputs

Impact

Low-Medium priority - outputs handling is important but the current test does verify execution counts which indirectly confirms some aspects.

Suggested Enhancement

Add explicit checks for:

1. Resolved conflict cells should have empty outputs array
2. Identical cells should preserve original outputs
3. Outputs array structure is valid

Backlinks:

• PR [FEAT] Create a Testing Harness #34: [FEAT] Create a Testing Harness #34
• Requested by: @Avni2000