chore(tests): use gender-neutral example names (#112)
* chore(tests): use gender-neutral example names
Replace gendered placeholder names (Alice, Bob) with gender-neutral
alternatives (Jay, Alex) across all test fixtures, mock data, and
scripts. Aligns with project language standards.
* fix(tests): remove real surname from mock display names
Replace "Jay Graber" with just "Jay" to avoid using a real person's
full name in test fixtures.
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