fix(fhir): no-issue: stabilise flaky Patient given-name filter test

[passcod]

Changes

🤖 The materialised FHIR test Patient › filters patients by firstName (given) is flaky.

It creates three patients (two named "John", one "Bob") and asserts given=John returns 2. But the FHIR given search is a case-insensitive prefix match (^John) over name.given, which is materialised as [firstName, middleName]. fake() assigns each patient a random middleName, and roughly 0.4% of the time the "Bob" patient's middleName starts with "John" (e.g. "Johnson", "Johnathan"), so it matches too and the count is 3 — about 1 failure in every ~250 runs.

The fix pins middleName: null on the three patients so only the explicit firstName drives the match.

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3 agents reviewed this PR | 0 critical | 0 suggestions | 0 nitpicks | Filtering: consensus 3 voters

No issues found. Looks good!