Add async person gateway APIs

[zigdanis]

What

Adds async/throws APIs alongside the existing callback gateway and use-case methods.

• bridges callback gateways with checked continuations
• exposes async add, edit, remove, fetch, and widget-fetch operations
• makes CachePersonsGateway own the structured async implementation
• checks cancellation before side effects and before database commits
• keeps callback call sites compiling for the final migration layer

Checks

• scripts/check-formatting.sh
• scripts/check-secrets.sh
• swiftc parse check for changed Swift files
• focused async success, error propagation, and cancellation tests in CI

_{Stack #25, above PR #26.}

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Review details

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📥 Commits

Reviewing files that changed from the base of the PR and between 3d36ded and 68c2e91.

📒 Files selected for processing (14)

• Core/EntityGateway/Cache/CachePersonsGateway.swift
• Core/Gateways/PersonsGateway.swift
• Core/UseCases/AddPersonUseCase.swift
• Core/UseCases/EditPersonUseCase.swift
• Core/UseCases/FetchPersonsUseCase.swift
• Core/UseCases/RemovePersonUseCase.swift
• GrowingUpTests/Gateways/CachePersonsGatewayTests.swift
• GrowingUpTests/Helpers/UserCases/AddPersonUseCaseSpy.swift
• GrowingUpTests/Helpers/UserCases/DisplayPersonsUseCaseSpy.swift
• GrowingUpTests/Helpers/UserCases/EditPersonUseCaseSpy.swift
• GrowingUpTests/Helpers/UserCases/FetchPersonsUseCaseSpy.swift
• GrowingUpTests/Helpers/UserCases/RemovePersonUseCaseSpy.swift
• GrowingUpTests/UseCases/AddPersonUseCaseTests.swift
• GrowingUpTests/UseCases/FetchPersonsUseCaseTests.swift

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[zigdanis]

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