Test coverage analysis

[Kay-Zee]

Closes: #???

Description

Analysis of current test coverage, and identifying testing gaps, with assistance from Claude code.

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For contributor use:

• Targeted PR against master branch
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Code follows the standards mentioned here.
• Updated relevant documentation
• Re-reviewed Files changed in the Github PR explorer
• Added appropriate labels